I have two Schwinn's from a local Box Store. They spent some time out in the weather last summer, and now that it's time to break out the trailer to give the kiddo's a ride, I notice rust on lots of the bolts and such. Is there a product that will take that off, or halt its progress? No concern for aesthetics here, but since I'll be towing the kids, I don't want any bolts rusting through while we're on the road. Thanks.