WD40 use..

[kball]

If you're the type to use belt dressing on squeaky belts try WD40. It's cheaper, works better, lasts longer.

 

[Steevo]

If you have dried on bugs on your grille/hood/bumper, spray it all liberally with WD-40 about an hour before you take it to the spray wash, and the bugs and guts will wash right off with no scrubbing.

 

[barguy]

I have used it to free up stiff dead bolt cylinders with good success.