We had unfinished French Doors (pine) installed well over a year ago and are just getting around to painting them. The glass panes have a plastic coating on them. The doors came with instructions for finishing which said to sand with a fine grit sandpaper prior to staining or painting (we're painting) but don't use an air compressor to blow the dust off because of the possibility of getting oils in the compressed air on the wood. My compressor has a filter on it but I can understand their point. They suggested brushing the dust off. I've brushed vigorously but can see small bits still in crevices. How about using mineral spirits with a rag or some other way to remove the dust. I'm hesitant to use a tack cloth as they always seem a little oily too.