Clean, clean, clean....everything. Under vanities, behind toilets, make glass shower doors free of water marks.
Remove toiletries from the countertop, tub and top of toilet. Get a basket and plan to store any shower items in the morning before you head out in case you get a last minute showing. Store the basket under the vanity.
Put out big, fluffy towels, candles and fancy soap dispensers to create a spa-like experience.
Remove as much as you can underneath the vanity to show extra space.
Replace your shower curtain if you can't get it squeaky clean.
Fix leaky or running toilets and replace discolored toilet seats.
Remove hard water stains on faucets and shower heads.
Tuck away trashcans. If you don't have room, make sure they have a liner and are empty for showings.
If you have a linen closet, remove anything that is worn or takes up room. Refold everything and color coordinate. You want to give the appearance that there is ample room in the closet.