"Gunk" removal

If you have gunk on a knife (for example, adhesive residue on a swiss army blade from opening multiple boxes), WD-40 will remove it easily.

Shiny Pennies

If you want to restore old, dull pennies to their former glory, here is the chemical recipe:


-1/4 Cup White Vinegar
-1 Teaspoon salt

Mix the salt and vinegar until the salt dissolves. Once homogenous, add the pennies to the mixture and allow them to sit for five minutes. Afterwards, remove the pennies and rinse them with water to end the chemical reaction.