I held out cleaning my corrector plate on my CPC 800 as long as I possibly could, but it's been dirty. Not dust, some sort of sap or grease in small drops. I got most of them off with just a little bit of pressure with 100% lint free cotton pads.
There were two spots that just smudged, so I went onto Celestron's website to see what the recommend, and it said 70% isopropyl alcohol and 30% water. I mixed up a little bit and easily got the sap off, but it left a streak about the size of my thumb in both spots. Anywhere the solution came in contact with the glass.
I did some searching on CN and found a few suggestions that I'll pursue.
All that said, I'm bringing my scope with me this weekend and won't really have time to clean it before I go. Will I notice the streaks observing or photographing? Is there a danger to not taking care of it immediately? I shouldn't be worried, right?