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I don't know if this helps much - that Tele Vue site information was good - but if telescope lens coatings are anything like camera lenses, you shouldn't have any problems. Coatings on camera lenses are usually applied at quite high temperatures, which is one reason why it's hard to get them replaced. You risk shattering the glass though thermal shock. I assume telescope coatings are the same. The point is that, as long as there are no foreign particles in that residue and as long as you don't press too hard, you should be okay. The vibe isn't good but the risk isn't as high as you think. They're pretty tough.
My experience is with high grade camera lenses (it's part of my job) and I have yet to (knowingly) damage a coating through cleaning.
One practice which works is to fold lens tissue in one direction until you get a sort of roll about the size of a cigarette. Then you rip it in half and it leaves a very soft but firm part to clean with. It's actually firm enough that you can use quite a bit of pressure. For pretty obvious reasons, I never really pushed all that hard.
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