We used Butta wax, a plastic Toko scraper and a Holmenkol fine brass brush and a polish with a fine scotch pad. The white marks were there straight after scraping though.
I'll try scratching some wax in a bit.
Edit: If I scratch at it, it does darken a bit, but I don't seem to get any wax off.
Last edited by Alex B; 12-31-2012 at 05:45 AM.