I'll clean twice without payment, then they get a visit on their doorstep, if they still don't pay they get a letter.
If they still ignore my requests for payment they are issued with a "7 day notice", then after the seven days if they haven't paid they are taken to the small claims court.
I'm just going through the courts at the moment to collect a £20 debt, so now that £20 has now increased to £50 because of court costs and admin fees.
Stupid really, but I wont let people get away with trying to rip me off!
All of my custies are great payers, but every now and again you do pick one up that's a pain in the ass, and they wonder why they can never keep a w/c?? (pr1cks!!!)