Yesterday I was having a little trouble getting a stain out of the carpet, even with a rag and cleaning fluid. So I tried using a toothbrush which was no longer good for teeth. Bye-bye stain!
A toothbrush can also save your hands when you are trying to scrub a stain out of material. Its a good idea to save all your old toothbrushes and label them "for cleaning." You might want to keep those in the worst condition for a job for which they will be thrown out after, like cleaning the bottoms of really dirty shoes.
You can also use a toothbrush to clean costume jewelry, combs, stove burners, baseboards, grout and around faucets.
A soft toothbrush helps to clean crumbs and burned batter from the nooks and crannies of waffle irons and indoor grills. And if a damp rag doesn't work, use a bit of toothpaste on a toothbrush to scrub away the crayon or other marks on walls, then wipe away the toothpaste with the cloth.