Nah no damage done. Cleaned the corrector with twenty cotton wool buds, still some smears on it, but only when you look from certain angles can you see them. The UHTC seems to be very resilient and no damage was seen. I even looked for fine scratches, but none to be seen. I was worried there for a moment, but now know that it is not a big a deal as Meade and others make out. Just make sure you dust first though.