S.S.
My fav, which I have only had to use once thank goodness, is plain old olive oil for lice infestations. Forget that nasty poison. Dose all the affected heads well in oil, especially the roots, pop on a shower cap and send the kids to bed. Wash everyone's hair in the morning, and enjoy the sensation that all those horrid beasties have been smothered overnight. Repeat after eight days to make sure no eggs survived, and you are both done AND everyone's hair looks great. (Except my husband's, because he has none.)
And white vinegar is great in so many ways. It works as a natural weedkiller, gets the stink out of all those nasty workout shirts, and with a little baking soda will power the grey right out of grout.