I don't entirely know what made me think of this, except that the layered bedding came in handy a couple nights ago!
1) Layer bedding. This is really a tip for parents. Mattress protector, fitted sheet, mattress protector, fitted sheet. If you have a barf incident, a bed-wetter, or a leaky diaper, you just pull off the top fitted sheet and mattress protector and you don't have to re-make the bed in the middle of the night!
2) If you use dryer sheets, save them after they go through the dryer and use them to clean your bathtub. They cut through grime really well and leave a protective film so the tub gets less grimey next time. (I don't use dryer sheets anymore, but this is a great way to re-use and it is incredibly effective.)
3) Baking soda is an awesome soft scrub. I usually use it alone to clean the tub - just sprinkle it on like you would Ajax or Comet or any other scouring powder. For a really dirty area, cut a lemon in half and cover the pulp side with baking soda. Scrub with the baking soda-covered lemon. It cuts through grease and soap scum, and it leaves the place smelling lemon fresh.