Tinkernut shows you how to repel steam from mirrors and windows by using shaving cream. Believe it or not, shaving cream is an excellent way to prevent mirrors or windows from becoming fogged over. Just smear shaving cream over the window/mirror and wipe it off using a damp cloth. It should now prevent the window/mirror from becoming fogged over from steam. If it wears off, just repeat the process. Use this as inspiration for one of your April Fools Day pranks!