If Duct Tape is the most useful object commercially available today, then WD-40 must come in at a close second. It is distributed in blue and yellow cans of varying size, with WD-40 emblazoned shamelessly across the front. There is also a WD-40 website, which, among other things has a WD-40 fan club. Along with
duct tape, it is another thing that really handy to have in emergencies. It can be found in home improvement/DIY stores; just ask the nearest helpful store employee to point it out to you.

At first WD-40 seems to just be an interesting, but meaningless, product name. The name WD-40 is not meaningless at all, but rather stands for "Water Displacement perfected on the 40th try." You can find out more about its history at WD-40's
history page.

Uses

Most people think of WD-40 only as a lubricant, but it is useful for so much more. The can itself says it:

• Lubricates moving parts such as: hinges, wheels, rollers, chains, gears;

• Cleans most surfaces of: grease, grime, tar, adhesives, gum, tape, crayon, scuff marks, water deposits;

• Protects against rust and corrosion on items like: tools, firearms, sporting equipment;

• Penetrates to free stuck parts, like: nuts, bolts, valves,
  locks;

• Displaces moisture to restore wet or flooded equipment, such as: engines, spark plugs, power tools.

As can be seen from the list on the can, it is quite a useful product. In addition to the listed uses, many people have decided to use it in other ways. Most are variations of what is hinted at on the can, but others are rather more creative. Judge for yourself:¹

• Removes ink from blue jeans
• Removes old cellophane tape
• Removes stains from coffee cups
• Cleans magazines for an AK-47
• Cleans bed pans
• Frees up stuck keys on organ
• Dissolves glues
• Softens stiff leather sandals
• Spray on balcony to keep pigeons away (they hate the smell)
• Removes peanut butter from dog hair

There are many more uses for it. This researcher has found that it does a good job of cleaning his car and car windows, although it has a tendency to streak. Also, a WD-40 soaked rag is extremely good at getting fresh spray paint off things that have accidentally been sprayed.

One final thing of note is that WD-40 removes duct tape, thus proving the old saying: "There are only two things that you need in the universe: duct tape to make things stop, and WD-40 to make them go again."