I store my convertible during our Chicago winters. I normally perform a complete wash and detail prior to covering. Unforturnately, this year I didn't get around to washing in time. Current outdoor temps are around 18 deg. and my garage doesn't have a drain. Is there a product that can clean in lieu of washing prior to detailing that you guys recommend? I was thinking of using Megs Quick Detailer spray. I am worried about scratching while wiping the dirt even though I will follow with PC7424 & FPII/glaze/FMJ. If there isn't anything safe, then I will probably wait until spring and just do an interior detail.