A mistake i did, was not to put my prices up for many years. Each time i gained new work, I would obviously price accordingly and so collectively, i used to be content with the amount. However, the price range between them was too great and with a better business head on, I amended this and hiked the prices up. Many were increased by £5 and more. The lowest increase was around £2 and it was more these ones who complained and not the £5 increases.
Since then, i now aim to increase prices every 2 years as it trains your customers to expect it as well, more than anything. This is because I lost a small handful as I had conditioned them into thinking cheap prices for window cleaning. It was my fault. Lol i still gained financially but it was a lesson learnt, not to wait so long next time.