1. Soap and water
   Windex
2. Cotton swabs dipped in alcohol
   Bleach

Cotton swabs or Q-Tips dipped in alcohol are the ideal way to clean the metallic contacts between your printer and toner cartridges, since it will not corrode anything, and it will pick up any errant toner, powder or dust that has collected there.

1. Warmth
   Vibration
2. Dust
   All of the above

The IBM Q System One, the world's first commercially available quantum computer, is a huge leap forward in computing. It's an early step though, and requires a home free of vibrations (including noise) heat (it needs to stay in sub-freezing temperatures) and really anything else.

1. A rag
   A sonic bath
2. A can of air
   A vacuum cleaner

In order to clean under the keys of a keyboard effectively, you need a can of compressed air at the very least. Ideally, you would remove the keys (they make tools for this) followed by using a can of air, a brush, and a vacuum to clean up all the dead skin and dust particles.

1. Rubbing compound
   Nail polish
2. Paint
   Paint stripper

Rubbing compound is the key ingredient of getting rid of a scratch like it never happened, so long as it's a normal scratch and not a huge bite from that time you smacked a semi. Wash the area, apply the rubbing compound, buff it thoroughly, wash it again, and wax it like you work in a spa.

1. Clean the coils.
   Replace the R-32 gas.
2. Turn it off and on again.
   Rinse out by pouring water into the filter while on.

The coils of the air conditioner need to be clean in order to work properly. If your AC is mounted out of a window, you need to find a way to spray water into the outside of the unit, either with a garden hose from the outside, or even a powerful water gun.

1. Remove the barrel.
   Remove the magazine.
2. Slide something between the pin and the hammer.
   Check to ensure it is not loaded.

After cleaning the work area and making sure you have everything you need, the very first step in cleaning any firearm is making sure it isn't loaded. Many firearm-related accidents result from the owner not realizing that their gun is loaded, and plenty of those occasions happen when someone is cleaning their weapon.

1. Check your dashboard.
   Look for a tag on the rear left wheel.
2. Check the owner's manual.
   None of the above

The owner's manual will have lots of information specific to your car. Filling the tires on a car isn't like doing it on a bike. Your car wants a specific tire pressure, unlike your bike, which just wants to be as full as your hand pump can make it. The manual will tell you what psi you need for your tires.

1. Wrap your water heater in a water heater blanket.
   Use dish soap to run the dishwasher.
2. Keep your AC's filters clean.
   Cook smaller meals in a toaster oven.

Cooking smaller meals in a toaster oven uses less fuel than a regular oven, a clean AC will need less energy to cool things down, and a water heater blanket will help the water heater to retain heat. Filling your dishwasher with any brand of liquid dish soap that isn't specifically for dishwashers will result in a messy flood.

1. It's always on the left.
   It's always on the right.
2. It's on the side the filling icon is facing.
   It's on the side the filling icon is facing away from.

There's nothing like pulling up to a gas station and realizing you don't know what side of your rental car has the gas port. On your dashboard will be a little fuel pump icon. The direction it faces indicates the angle the pump handle would be inserted into the car, which tells you which side of the car has the port.

1. Penetrating lubricants
   Grease
2. Dry lubricants
   Boil lubricants

Boil lubricants are not real, but oils are. Oil lubricants are good for reduced resistence and wicking into enclosed spaces (like the inside of a hinge). Grease is heavier, and best for use in machines that are infrequently used, might get dirty, or when you're worried the lube might move.

1. Soap
   2 tbsp baking soda in 1 qt hot water
2. 1 pt apple cider vinegar in 3 pts hot water
   Any of the above

If you don't mind the smell of the soap, you can use soap to clean a smelly fridge (after emptying it completely, of course). You could also use the baking soda mixture or the apple cider vinegar mixture, which will not smell strongly, and has the chemical grit to remove dirt.

1. Slather the hull with grease.
   Paint the hull black.
2. Paint the hull with copper paint.
   Build the hull out of metal.

Copper is an unusual substance with many interesting properties. It is anti-microbial, which is handy for hospitals, which use copper paint on walls. It also stops barnacles from growing on it, which is why ships are often painted with copper paint from the water line down.

1. Use a toothbrush to scrub the fulcrum.
   Use a toothpick to open up the little holes on the arm.
2. Spray it with hot water, in the sink.
   Put it in a sonic bath.

Toothpicks are handy tools for cleaning a lot of things, one of which is the spray arm of a dishwasher. The spray arm has little holes in it that can get clogged up with food, but a toothpick is a handy tool that you can use to unclog those holes without any fuss.

1. Every 7,000 miles
   Every 5,000 miles
2. Every 10,000 miles
   Every 9,000 miles

Tire rotation is one of those big deal things ignored by most car owners. Rotating tires improves grip, which is a matter of safety at a minimum. It will also improve fuel economy, and it will mean you don't need to buy a new set of tires too quickly.

1. Fill it with helium.
   Find the leak by using a feather duster.
2. Run for your life.
   Take off all your jewelry.

When your MRI machine says it needs helium, it needs helium. MRI machines use helium to cool the magnet inside the machine in a way very similar to a household air conditioner.

1. Open and detach the brake calipers.
   Remove the front fender.
2. Remove the bolts holding on the front fork.
   Put the bike in gear and brace the rear wheel.

Before the major removal of front bits, you have to lift it up and brace it. To do that, and this is the step before lifting the bike, be sure to stop the rear wheel from rolling around. One easy way to do this is to put the bike in gear (thus providing some resistance) and brace the rear wheel, probably with a chock.

1. Denatured alcohol on a rag, then oil
   WD-40, then oil
2. Soap and water
   Any of the above

If done properly, any of these methods will clean a Swiss Army Knife. Using alcohol, be careful not to get it on the plastic, or if you do be sure to rinse the whole thing thoroughly after you do, perhaps even soaking it in water. However you clean it, be sure to oil it afterward!

1. Joints
   Hydraulics
2. Nothing
   Wheels

Many people are not aware that WD-40 is not actually a lubricant. In fact, WD-40 is technically a degreaser, meaning it removes oil. If you want to lubricate a hinge, or wheel, first you should use WD-40, then you should dry it off and add oil.

1. Take out the smokebox screens.
   Wash out the locomotive.
2. Close the firebox doors.
   Close the ashpan doors.

Closing the doors to the firebox after dumping the fire is very important because if cold air gets inside the firebox, it will cool too quickly and the metal of the firebox and boiler will distort, damaging the locomotive. This sort of damage can total a locomotive, or worse, make it dangerous to operate.

1. Use of virus software
   Mac ownership
2. Dusting it out
   Defragmenting the hard drive

Dust accumulates inside computer because of the amount of electricity inside them. From time to time, open up the computer and dust it out. There are guides online for almost every model of computer, showing how to open them up.

1. The ball cock
   The S-trap
2. The wax seal
   The inlet valve's gasket

The wax seal of your toilet isn't a thing it uses to ensure that foreign spies don't intercept its mail. The wax seal is a barrier placed on the floor, around the mouth of the S-trap your toilet connects to, designed to keep the flow of water from escaping the pipes.

1. Haul pyramids
   Transport myrrh
2. Entertain children
   Build treescrapers

Hero of Alexandria, an ancient engineer under the Roman Empire, designed a crude steam engine as an amusement for children. Records dating to the first century AD indicate he put this design, which was something of a steam powered pinwheel, into the Library of Alexandria, which later burned.

1. Change filters.
   Push a ramrod through the line.
2. Open the motor compartment and check for debris.
   Remove the dust bin.

In order to determine why a vacuum lost suction, it is important that you check every part of the line, and the easiest way to eliminate most of the line is to remove the dust bin. This leaves only the motor, and the line between the bin and the motor.

1. Remove the bolt carrier assembly.
   Clean the barrel with a bore brush.
2. Remove the gas tube assembly.
   Remove the receiver cover.

While all of these answers represent correct steps in taking care of the most devastating weapon ever invented, only one is the first step. Removing the receiver cover is the first step in disassembling the weapon, which is the process that has to happen before cleaning it.

1. Lube it up once a year.
   Spray it with WD-40.
2. Use a little spray of degreaser and then lube it.
   Soak it in degreaser, then lube it.

Degreaser may not be a product most people are familiar with, but it is the best way to take care of a bicycle chain. Spray a little on an old rag and use the rag to rub down the chain. Once the chain (and you might want to do this to the gearset, using a soft toothbrush) is free of gunk and dirty lubricant, apply a lubricant.

1. Over-tightening the clutch
   Tearing the oil filter
2. Puncturing a tire
   Over-filling the oil tank

An over-tightened clutch can cause it to slip unintentionally and you may not even realize it is happening. When doing maintenance, it's important that the clutch has some play, so you don't accidentally wind up in trouble while on the road.

1. Solvents
   Water
2. Soap
   Jetwash

While it sounds like a cleaning fluid, jetwash is not. Jetwash is a kind of wake turbulence specific to jet engines. A popular prank to pull on an aviation newbie who doesn't know better, is to send them on an errand to get a bucket of jetwash.

1. Hand soap
   Boiling water
2. Diesel
   Alcohol

Believe it or not, diesel fuel is often used to clean old-fashioned printing presses. This is for a number of reasons. It works like a solvent for the oil-based inks, and it won't corrode anything. Also, the residual diesel fuel will work like a lubricant.

1. The CPSRS Inlet Temperature Sensor
   The Forward Outer Seal
2. The Nozzle Assembly
   The Ignition Exciter

The CF6-80E's forward outer seal is the most expensive component of the engine, costing about $1,603,000. Jet engines are ridiculously enormous machines of incredible complexity requiring experts to maintain, so if you own one, don't try to fix it yourself.

1. Lubricate the air fitting.
   Inspect the cabling.
2. Check for loose screws.
   Clean the feed system.

All air-powered tools are subject to a lot of vibration. As a result, screws can loosen, and a loose screw on a pneumatic nail gun can mean it bleeds gas and doesn't operate well. While the trigger needs to be able to move well, the screws should be kept tight, to ensure the tool operates at maximum efficiency.

1. Every 100,000 miles
   Every 50,000miles
2. Every 10,000 miles
   Every 20,000 miles

Spark plugs are not immortal. You might not notice this if you only drive every once in a while, or if you only go short distances, but spark plugs do eventually fail and when they fail, there are fewer explosions in the engine, which leads to less power.

1. Automatic coupler
   Firebox
2. Sandbox
   Ashpan hopper

While the smokebox might also collect some ash, the bulk of the ash clogging up the works will be found in the ashpan hopper, which can be emptied by attaching a lever that opens the ashpan hopper doors under the locomotive, best done over a place you would want to deliberately want to put a huge amount of ash.

1. Restart it.
   Try another cartridge.
2. Turn it off and make tea before restarting it.
   Call tech support, and cry.

It may sound a bit strange, but a good rule of thumb when a computer printer doesn't recognize a new cartridge is to turn it off, make a cup of tea, and turn it back on again. Modern printers don't really turn off as we imagine, and can solve glitches if given time.

1. Soap and water
   Denatured alcohol
2. Acetone
   Boiling water

Fountain pens aren't heavy equipment or medical gear. You don't need anything fancy to keep them clean. Most fountain pens are made with plastic compounds that will rot and dissolve if exposed to alcohol or acetone, and most will deform if you use boiling water.

1. The wiring
   The filter
2. The oil
   Look for cracks and metal fatigue

Hydraulics systems on garbage trucks are pretty important to the truck's operation, and they use a filter to keep unwanted fluids from mixing with the hydraulic fluid. Were this to happen , not only would it not function as well, but operating the hydraulics at all could damage them, necessitating major repairs.