A driving instructor rang and booked in a 3 story rented town house, i cleaned it once no problems. When i cleaned it the second time there was no answer, so another month came round and i did them again ( still no answer)
I called a few more times no answer.
Found out that he moved house without tellling me!!!! But im thinking about block booking some "driving lessons" and when he turns up i can kindly ask him for my £20.00 he owes me 
who is in favour??
This happened to me recently. Custy works away a lot so not unusual for her to pay 3 x clean and I don't mind as I am aware of this that is why I clean the second and third times. After not receiving a cheque for the 3 outstanding payments I called round and the new tenant informed me she had moved in with her boyfriend two weeks before I cleaned the house for the third time.
Now my initial reaction was 'cheeky biatch' but after calming down I sent her a very polite text explaining that I had called round and had been informed of her moving out. She was incredibly apologetic and enquired how much owed - I said it was techinically 3x price as although the third clean was completed after she had moved out she had failed to let me know - she agreed to send 3x and a cheque arrived a few days later.
My advice is to just give the guy a call or text and you may be surprised with the result - I still believe that in the main people are generally good and this attitude tends to serve me well - ok I do meet up with the odd tosser but that's just the balance of life
On a side note, when I called and spoke to the 'new' tenant I asked if he had seen my 'cleaned your windows' slip he just said he thought it was something to do with the old tenant! Load of old tosh! Why couldn't he have given me a quick call and explained there and then eh?
There we go - balance restored - one nice ex custie and a tosser to even things out
Cheers, Tom