If you have glass shower doors you know soap scum can build up leaving them foggy and hazy-looking. Smooth a layer of foaming shaving cream on them. Leave on for 5 minutes then wipe off and rinse (if your shower head has a long hose this can speed thing up). The surfactants in the shaving cream will have cut through the soap-scum build up and leave a slick finish that will repel future spotting. This will work to keep bathroom mirrors from fogging too..