I tried a hot scrape and it did nothing. Maybe I did it wrong? I waxed and as soon as I was done I scraped without letting it cool.
That's just a normal wax job. I think by hot scrape he means to let the wax wear off the base, clean it, then iron and scrape it before adding any wax. This should pull the dirt and old wax out of the base, then wax it up like you normally would.