But Matt stuff like that happens all the time weather you have visited in advance or not, what about the 6 weekly that has just had their house painted and you turn up to do your usual clean? handle it in the same way as you would that.
Costs a lot of time and money to drive around doing quotations, I would rather be ridden rotten by 1 or 2 customers a year than waste all that money and there is nothing to stop me changing my mind when I see the job if I feel like it, thats the beauty of being self employed.