Well I have been doing the place every 6 weeks for the last couple of years, it's a garage, a very busy garage, thick oil all over reception and office area, like I sad got mechanics walking all over it as I am cleaning it, it took me a good long time to get it anywhere near acceptable, due to the oil being so thick, tiles are synthetic and it gets a very good flush as I am having to make quite a few wet passes to make any difference, owner is happy and he uses me for all his rental properties so I am happy.