I think that if you want to build a successful round/business in window cleaning you need to have a solid customer base.
I've been going neally 2 years now. When I first started I would take on almost any job because it was work and money.
But, then I got to a stage where I had work due all over the place... For example I would clean 1 house that was every 8 weeks but clean their next door neighbour every 12 weeks or something silly like that... In the end it just didn't make sense working that way.
Now all of my customers except 3 very large and expensive ones are every 8 weeks. It works like a dream now!
Anyone who wants to break from the 8 week cycle is dumped! As an example the other day I cleaned a house. It was a £35 house which I do every 8 weeks. Customer pays me and says could you just come to me every other time (every 16 weeks) instead... My answer was NO, and she's now deleted from George... I don't want customers who don't want to fit into my round and my way of working!
Andy
Andy, you should have said yes but it would be £50/£55 every other time. Money is money at the end of the day and that is the point of having a business and thats to make money.
Simon, number to on your list: why dump them if they want to call you every six months that another customer thats charged a one-off cleaning fee that fits in when you are in the area when they call and it will be a bonus for that clean, think about it.
people that just dump customers I think are mad or richer than me, fair enough it they are a total nightmare, but a good house and good paying customer they can call me when ever they like but they pay a high price for this service and they are told this, then they have three choices either say the way they are (result), call me as and when (result) say no then I have tried to turn the customer to money 2 ways and they said no not my fault, cant talk badly about me

I am not saying I never dump a customer, there are many reasons I do but not in the way above anymore, I must have lost loads over the years listening to that info.
even if you only convert 1 of them out of 10 to call every six months it is still money you would not have had if you just dumped them.