It is frustrating when you try and put your prices up or give a quote only to be told that other window cleaners, or their last one were much cheaper than you.
This never bothers me though; if they don't like the quote/price increase I'll just move on. There's loads of work out there.
However, I think it's wrong to generally classify all window cleaners who price cheaply as dole-scrounging tax-dodgers.
I can think of three local window cleaners who charge a low price and appear to be happy with their income. One of them is a JW, a great bloke, who advised me not to charge to cheaply when I first introduced myself to him!
I pretty much work side-by-side with one mature fellow, in one area I/we do; a cracking-bloke (he gives me free fish he catches); who charges a fair bit less than me. I keep encoraging him to put up his prices, he keeps saying he will, but he hasn't; yet.
I think he's just happy with what he's charging, and there's nowt wrong with that.
My advice would be to advertise this forum to your fellow window cleaners, since what some lads are earning here is a real eye-opener! That'll encourage them to put their prices up!