Slip-sliding Soap:

In many hotel rooms, the bathtub/shower enclosure comes with built-in shelves for soap. These shelves lean downward just enough to drop every bar into the tub. They have always annoyed me, but last week I dscovered how to persuade my soap to stay put. Take a wet washcloth (most hotel rooms have too many of these, anyway) and plop it onto the little shelf. The cloth probably won't slide off. Then tuck your soap between the washcloth and the enclosure wall.