Thanks guys, I knew I wouldn't have to wait long before someone came along with the answer. (David, you're always on here. Don't you have a day job?) I appreciate the handy article, Bruce. I'll study it up before I attempt anything.
I haven't been in a hurry (the luxury of multiple scopes I guess), and I know all the advice about never cleaning optics unless they REALLY need it, but once I disassembled both newtonians, I couldn't believe the amount of crud I had on the old dob. Since then I've persuaded myself that I just can't see as much as I could before.
Cheers,
Brian.
PS Where do I get demineralised water?
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