[Sailfish]

I store my car in the garage (attached to the house) and keep it covered as well. I check the wheels on a regular basis to ensure moisture isn't building up/collecting on the wheels. I've found that moisture can collect on the wheels as a result of humidity changes/opening the garage door/temperature differential from inside to outside/etc. I've also found that a light buffing with a good metal polish or coat of auto wax helps minimize any affects of unwanted moisture. I wouldn't stress over it----------just make it an item to check on every now and then.