Rob
Had a little try last night with "hama" brand Optic cleaner (German) and supplied lens tissues.
Appears to have removed the original crud but I noticed there's some form of dark purple smearing as a result. I'm hoping that's just alcohol residue from the cleaner not being pure enough and ideally suited to SCT optics and that I've not smudged/ moved around the plate's coatings??? I seem to recall they were of a dark purple colour too.
Anyone know if that's possible? Can coatings be dissolved and moved around on the surfacee of the plate or am I just seeing residue from the alcohol-based optical cleaning fluid?
Anyway. There don't appear to be any scratches which was my big concern.
I'm going to have another try with distilled water, isopropyl alcohol (90%+ pure) and some surgical cotton/ unscented kleenex to see if I can get it completely clean.
And then ... if I'm lucky and the problem's fixed, I'm not going to set up the 9.25 in the same spot ever again. That's a promise I've made to the Gods of Astronomy if they let me off the hook this one time
