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The TeleVue site offers the definitive answer.

In particular, note the suggestion of "fogging" with breath after use of the alcohol (or other solvent). I have found this to be THE finishing touch on any optical glass I find in need of attention.

It works extremely well.

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I wholeheartedly agree, fogging with the breath and wipe off gently with a lint free lens tissue will remove nearly 100% of residue from cleaning fluids. Even Purosol will leave a residue, it's harder to see but it's there but your breath fog will remove it as well. And, as a last resort, for those pesky stubborn spots that just won't lift off....human spit on the end of a clean finger rubbed gently on the spot and 9X out of 10 the spots gone. Then clean that spot again with cleaning fluid followed by breath fog.

Tim

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Lone Mountain Observatory
Andover, Maine



Takahashi Mewlon 180
Giro III w/Sokkia Tripod
Losmandy GM8 w/tripod

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