anit-fog on shower doors?

does anyone use any kind of anti-fog stuff on large glass shower doors?
is it ok?
which brand?
does it work?
thanks

Answers:
Years ago, I always used vinegar, straight from the bottle, and applied it to my eyeglasses to prevent fogging in the winter. It always worked and I think it would work on shower doors or windows.

Other answers:
Get Rain X at autoparts store
Get Rain X at autoparts store
the best thing I found that works, not long time, it works for about two months long.
take shave cream, Edge is what I use, and put it on a paper towel and then apply to the shower door, mirror, window etc. and then take a clean paper towel (s) and wipe until you can see through regular. Just make sure the door is clean before you do this other wise it won't work
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