In this case, it means that you can hire this company to clean the carpeting of an apartment when you move out (so you won't leave it dirty for the next tenant and possibly lose part of your deposit for cleaning fees) or when you move in (if the last person has left it dirty). "Ins" and "Outs" can be used as nouns in certain idioms -- for instance, if you "know all the ins and outs" of something, it means you "know it backwards and forwards"; you understand all aspects of it.
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