[mark dew]

But you're not going to be knocking out four-houses an hour like young Leekson!
So is the maths worth it... 
1.   Time spent working longer on a window, on stuff that may not even be noticed; is that worth the loss of income?
Or
2.   Clean the glass only; then move on; risking the loss of the odd customer here and there (remembering it's easier to find customers than for customers to find window cleaners)?
From a business point of view, once your established, I think Number two makes more sense.

Alright Tosh, am sure your right. You know your round. But there is a 3rd way.
By maximising your potential earnings from each customer.
If you could only get half of your 300 customers to pay an extra £1 for frames cleaned then that is an extra £1800 per year, for not moving or travelling. As you are cleaning WFP you are doing it anyway. Get a mini pole for your mrs and all windows will have their frames cleaned anyway. It seems a very profitable add on for what is very little extra work after the 1st clean.

mark