I should just copy and paste my replies....this is the fourth post I've made on this topic!
Two key parts: containment and ventilation. As said aabove, get car mats. The ones with rope sewn into edges seem best. Plastic edges break. As for ventilation, it's best to pull dry outside air through garage with a window fan, 4" duct fan through the wall, or ceiling fan ducted to outside (NOT attic). Second best is to just blow the air around, which will help is evaporate, but not dry it out as per exhausting it will. Even if you have a puddle under the car (we do all winter), so long as you are exhausting it out you won't have moisture issues.
The rope edged mat is under the van, the crappy plastic edged one is under the mini (sorry honey - lol!)