We are still having mild weather, which is a blessing, we're well up on our yardening and GH chores. I cleaned the exterior of the panels, using a siding cleaner from Ace, and WOW. I never imagined just how much dirt was there till I got started. I used a floor mop with a scrubby like surface and it did most of the work. I thought it would give me better light when I put the solar blanket on, hopefully this weekend.