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You might want to copy and print this...
Cleaning refractive optics 101:
Required tools: Name brand plain white Kleenex. Name brand plain windex.
good quality Acetone. Garbage bag for spent tissues. Can of "dust-off"
1) Blast optics with Dustoff to remove any grit. ( Purge the can first...or you'll have a lovely propellant spot as well)
2) Either lightly spray corrector (large optic) or tissue (small optics) with Windex.
3) *gently* remove windex from surface.
The rule is:
One wipe= one tissue
(tissue's are *really cheap* optics are not)
4) Blast with Dustoff again... does it look clean? Then stop now.
5) Still have marks? Then soak tissue A with acetone, and have a dry tissue B handy to *gently* mop-up any excess.
Remember...one tissue = one wipe!
You may be left with some "evaporative" marks on the coating... don't rub them with a dry tissue...they do no harm, so learn to love them.
6) Blast optic with dustoff agin to remove any debris.
7) Still not clean?
O.K......You really need to be able to determine whether you have a coating failure or similar before getting too agressive with alternative solvents.... seek professional help, as a dirty optic is way better than a scratched one.
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