Realty One Group
Will Jenkins | http://www.mightycleanservices.com
There are also general rules that allow for normal wear and tear, Carpets may/ may not be one of them. Things of this nature should be handled originally before the tenant moves into the apartment and put in the lease so no disputes can be arisen.
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If the carpet was not clean when you moved in, chances are you wouldn't have to.
How long have you been in your home or unit?
Did you have pets, kids, smoke?
Do you have any idea how old the carpet is?
To play it safe, have it cleaned. Call something like Stanley Steamer. Most landlords don't want you to go rent a carpet cleaning machine to do it yourself - you may ruin the carpet.
More detail on carpets, damage to carpets and how much a landlord may charge you to replace a carpet are on RentLaw.com - link below.
For a tenant to get back thier full security deposit there are several things they need to do. Regarding carpets, my leases states, "All carpets have been professionally cleaned and written proof given to landlord."