What did you do to that poor machine???
Don't know if you have access to it but the best way to get remove dust is to blow it out with compressed air, preferably from an air compressor. Otherwise it's very difficult to get the dust that is inside things like power supplies.
Yeah it's not in the best of places for dust (in the same room as a tumble dryer)
Got most of it off with hoover, but next time will be buying some compressed air cans, or try and remember our portable one.