Bought some coating online, it is supposed to be wool, but it felt dusty so I gave it a gentle wash. The dustiness has gone but there is a lingering smell of paraffin even after two washes and some fabric conditioner. Any suggestions? If I can't shift it, there is obviously no point in wasting time making it up. It has been 'airing' in my sewing room for a few months and the smell seems to be increasing rather than diminishing.