Anybody know where to find a good cleaning company to clean the house after renovation. I need to clean the car porch tile that the white cement keep appearing after cleaning. Try so many detergent still can't help. Please help as i am moving in on this Sat. :

The contractor used the acid to wash and the white colour thing (looks like chalk) still appear. I am quite confused. Hardware shop said never use acid to wash as it will discolour your tile and those white colour thing is the caused of using acid. The contractor said must use acid to wash if not how to clean those white colour thing. Do not who is true