Mildew

[Punkstig]

Without power your best bet is reusable moisture collection packs, but I don't know how effective they would be in that sort of size space

I use one of these in my car and it's done a damn good job of stopping the windscreen from fogging up in winter (it used to be a nightmare)

http://www.amazon.co.uk/dp/B00I3VKBJS/re...e+absorber

Putting a cover over the bike in the garage and placing a couple of these on the seat would probably increase the effectiveness of them a little!