Neil
Great question but I am afraid that there is no hard and fast method. It depends on what crystallizer was used! Sometimes we have had floors where it has flown off with HDT&G. On others we have added honing powder to the HDT&G and it has come off and others we have stripped just using a stripper and then there have been some where the only way we have been able to get it off was to grind it. Ultimately it all depends on the product used!
Test! Test! Test!
Kev