First, some background. We bought for our home renovation over 3000 sq ft of terrazzo tile from Wausau Tile several years ago (the vendor is called now Techtura Designs, a Wausau Company). The tile had a manfucturing defect in which the machine that applied the 3M sealant on the tiles left swirl patters in the sealant and failed to seal the tiles to the required thickness. Neither we nor the installer (so he says) noticed the defect until the floors were installed. Wausau was VERY DIFFICULT to deal with, but after about 1.5-2 years they agreed to pay a "3M certified company" to burnish and reseal the tiles and pay for moving furniture while the work was done. The burnishing company did a so-so job in burnishing out the swirls, but left us with an even bigger problem with the tiles/grout. Remember, these are 18x18 tiles, not a poured floor. There were no instructions telling the original installer that it was imperative that the tiles be layed "quarter flat," a term used by the burnishing to describe sliding a quarter from one tile to another with absolutely impediment. So our floors had slight height variations tile to tile. When the burnishing machine moved from tile to tile, it would leave a burn mark on the higher tile. Then, once the sealer was reapplied, the burn mark was sealed in and the grout was sealed such that it cannot be cleaned. I would like to find a way of removing the seal from the tiles/grout so that the burn marks may be removed and the grout cleaned. I've spoken repeatedly with Wausau tile and 3M about this but have yet to find an answer. I even asked 3M if the chemists that created the sealer knew of a way to chemically remove it (thinking they should know...), but 3M said that burnishing was the only way. SO - does anyone have any ideas how we might remove the 3M sealant either chemically or physically. For the latter I'm thinking of a machine with smaller pads that a burnisher uses so that there would be less or more controllable overlap tile to tile. Any thoughts would be MOST appreciated. Oh, and NEVER EVER install terrazzo tile in your house from Wausau or its subsidiaries, but if you do, use a very good installation contractor who can lay the new floor very very flat. Thanks for listening!