Airlines clean the aircraft between flights

An aircraft is actually cleaned is something of a secret. Removing trash and old magazines is one thing, but most industry watchers say that a proper cleaning doesnt occur that often. The FAA doesnt regulate or inspect aircraft cleaning, so frequency and thoroughness are left up to the airlines themselves as a rule of thumb, an aircraft is supposed to be completely wiped down after every 30 days of service or at 100 flyinghour intervals. But in theory, that means that an aircraft can be used for dozens of flights between deep cleanings.