just being doing some maths, although I'm using my area to get the figures I don't think it will vary that much.
tomorrow ( and the day after... and the day after..etc..etc..etc) 35 people within 10 miles of your home will get their carpets or upholstery cleaned. lets say 10 of them will use a carpet cleaner who they know & have used before, but the only reason the other 25 will not be using you is they don't know you exist.
can you think of any reason not to aim your marketing at finding those 25 (within 10 miles) rather than the rest of the population who live 40-50miles away?
####pete you posted while I was typing######