I had the same problem with my seats. Also found the sandpaper clogged up very easily. In the end, I used washing up scrubs ( the ones with green scrub material and sponge combined)(cheap from Aldi/Lidl). The dust moved away from the contact area back into the remaining scrub material ( so no clogging up). Also, the green scrub material was just harsh enough to take away the glaze surface without removing too much Varnish and you can wash out the scrubs afterward, ready for another scrub tomorrow go when they dry out. Dave D.