Non-Gel Toothpaste:
Removes crayon marks on walls by gently rubbing the crayon mark, then rinse with warm water.
Deodorizes hands (from garlic and onion scents) by washing hands with toothpaste instead of soap.
Dryer Sheets:
Rub a used sheet over static-filled hair to tame the craziness.
(My own uses: Place in the bottom of a trash can to battle trash odors. Also, used dryer sheets make great dust rags!)
Coffee Filters:
Use as a mitt to clean windows and mirrors for lint and streak-free results.
Line flower pots so the dirt won't get stuck in the drain holes.
Other helpful hints that my grandma passed to my mom, which was passed to me:
For stubborn zippers that won't zip, rub a crayon on the teeth of the zipper.
Don't have a tide-to-go pen? Dab shirt stains with soda water.
For rust stains in clothing, squirt lemon juice on the stain, let sit in the sun, then wash.
For ink stains, apply hairspray to the stain, then wash.
There are soooo many more at-home remedies. One site where I found many of the ones listed (and more) can be found here.