dude they even do an amazing job on basic car wash (in/out) ,i can't even imagine how good they are on full detail ...youl'll see it , speaking of rain.. i wouldn't worry that much,at the end you'll have to deal with that rain anyway,in a day or two ..all you have to do is a dry towel ,my car still looks clean after a week(waxed last week),and it's been raining consistently