Vince you are correct - re the number of small priced cheques.
The way I do it is first clean I leave a card with it stamped on the back
'Your Windows Were Cleaned Today'
The next clean the same but with an additional bit stamped on the back
'Cheques Payable to :- xxx'
47 High Road
xxx
Essex
abc123
And attach this one to an addressed envelope
(I use the vistaprint stickers for this)
This cuts down on bank charges etc. As long as you are happy to wait for the payment.
I am looking to draft up a Payment Terms & Conditions Letter
for the ones who are always a little later than most.
We have all got them but they all pay up in the end