I have an old Schwinn that I bought 2nd hand. I don't know a lot about bikes. When I ride my bike after it's been in the rain, the gears CONSTANTLY slip as I'm peddling. If I use White Lightening on it - just a little bit - then it works fine. Can anyone tell me what the problem is? Is there a permanent solution so that I don't have to be afraid of the rain.

thanks