I have the same problem with condensation in my garage. I don't ride my Bonnie over winter, so what I do is spray it all over with WD-40 in autumn - paint, wheels, chrome & ally- in the spring I polish it off, and it has remained gleaming for several years now.Today must be the first in almost 2 months that it has been above freezing. We've had the coldest winter on record. The 'bikes are dripping with condensation in the garage as the warmer air hits cold metal...not good!
I'm going to try to wipe the water off to keep my Tiger's chrome and alloy shining..