Just in time for the rain!
I was eying this last night at full price, today I see it's on sale!
Rain-X Repellent review (skip to 1m:36s for before/after comparison)
Problems with foggy windows? (today only)
103ml Rain-X Interior Glass Anti-Fog $8.79 today only (20% off)
103ml Invisible Glass Anti-Fog Treament $8.79 today only (20% off)
Alternatives to Rain-X are Invisible Glass and Aquapel (not sold at SCA). Each have different application methods so make sure you follow the directions correctly.
Like to wash your car in the rain?
SCA Wash & Wax normally $9.99 + free jumbo synthetic chamois normally $11.99 for $7.96 (thanks puffinfresh)
Not used the others, but have used Rain-X (not on car windows) and it worked fine. Was easy to apply and did a much better job than without it. Was using it inside a chicken incubator with a glass window where the glass would constantly develop condensation due to the humidity/temperature difference. Worked well, was cheap, can't complain!