With these types of tiles, I wipe initially the way I do on all floors - flat shammy up and down the grout line. Then, after every half-dozen lines or so (depends on the area you are color sealing), I go back and wipe the lines again using a circular motion. By this time the color seal has dried enough on the grout lines but will still come off the tiles pretty easily. After running into this the first time, I began to price these types of floors slightly higher to account for the added time.