I have a lot of lenses through which have enough dust inside that their value goes down. I'm competent enough to take most of them apart and clean them out but the problem I have is getting the glass clean. It's particularly difficult with multicoated glass. It seems like everytime I get things back together I look and I've left a small wipe mark or a bit of dust inside. I'm using ROR but have also tried denatured alcohol when cleaning things out. I'm using microfiber cloths which are clean. Any tips on how to get things back together cleanly would be greatly appreciated. Thanks!