Hi, they are installing solar panels on my roof, hoping to go live in a week or two. But today was the first day any panels were on the roof. (still have 4 more to go). My question is, is this panel damaged? Most of the panels look clean, but a few have hand prints, and this one has some sort of discoloration. They are telling me they will clean the panels at the end of the install and this is no problem, but sad to say you really can't trust any contractor 100% in my experience. Please reply if you have experience and knowledge of solar panels. Guesses are welcome too, but really hoping for someone with first-hand knowledge to reply.