Doing a freinds pressed concrete floor Monday there was a seal used when done,, patchy in places now, what would be the best way to remove and clean and poss re-seal, I have a good power washer, Klindex, Monsterpads.I am a bit worried about going near the edge with chem as it goes right onto the grass. I know not your normal job the hard floor lads do but got to start somewhere.I would just normally power washed but don't think will remove the seal.