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Hi Mark,
The coatings will be quite hard on the lens, and will resist scratching well. It is not too hard to do yourself. Try the following:
1. Use a blower/blower brush to remove any loose particles on the glass surface.
2. Wet some tissues with isopropyl Alcohol (Painting section in Bunnings stocks it under the Diggers Brand). Dab the tissues on the lens, but make sure the tissues aren't totally saturated otherwise fluid may seep into the edges of the lens elements. Use a dry tissue to soak up the alcohol, but avoid a lot of rubbing. You just want to get the bulk of the dirt off by soaking it up.
3. Once the lens is mostly clean you can continue using tissues damped with alcohol, then immediately follow with a wipe with a dry tissue to remove the wet alcohol. At this stage I use "Dr Clays" cleaning fluid which is a mixture of Windex/Isopropyl Alcohol Distilled water/Photoflo. The Photoflo can be obtained from Photocontinental. This liquid is less likely to leave streaking on the glass, but I have also used Iso Propropyl alchohol successfully.
If you are nervous about try practicing on an old set of binoculars or photograhic filter.
Anyway good luck...
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