I would be very loathe to spray anything on the ML panels. Soaps and detergents can de-ionize the panels. I was talking to an ML tech about an issue with the panel on one of my surrounds (new house, turns out the freaking outlet didn't work--d'oh!). He was telling stories, and included one about a guy whose panels died after his maid sprayed cleaner on them. The tech advised him to try washing them in the shower with just plain water, which in that case apparently worked. I'm not sure I'm try that, however...