What's the best professional carpet cleaning method: steam, shampoo, or dry chemical?
In my opinion, one of the best professional carpet cleaning method is the steam method. However, dry chemical method is also a recommended method to clean carpets. Overuse of shampoo may cause a residue that even thorough vacuuming cannot remove.
Shampoo i'm guessing. Steam is good for tile and wood, but it wouldn't get deep enough into the carpet to do a good job..and not sure what you mean by dry chemical.