for customers wanting a 1 off clean (esp end of tenancy or putting the house up for sale) are asked to make payment
in advance via bank transfer or cheque (if enough time) or have cash on the day and i take it before we start the job
most are ok with this - had a couple that then 'cough, um and err' and want to think about it or complain about the price or suddenly decide that they need it before the end of the day, but i suspect these (very,very few) are messers.
Darran