Hammond Knoll are the elite in carpet cleaning as far as I'm concerned. The young man who comes out is superb. What I like is that they hire people with experience and they don't change every day. Sometimes in my past experience with carpet cleaners, the get people who know nothing about carpet. That's not how it is with Hammond Knoll.
My carpets always look so much brighter and cleaner after they come. I've been using them for years, and I recently recommended them to a neighbor who will be using them also.
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