I cleaned one conny roof and all the panels came up great but one. They werent in at the time of cleaning (regular customers) and they called me back thinking I had missed a panel. I was still in area for week cleaning windows so nipped accross and explained that it was the panel that had a tint to it for some reason. After climbing on ladders and scrubing a test patch they finally believed me. But they had to go to the trouble of testing it themselves.
After that I stopped cleaning their windows. A bit drastic you might think, but ive always prided myself on being honest and these customers for over 14yrs knew that from previous experiences, ie tried to pay for 3 cleans when it was only 2 for instance.
But also the hubby was a pain for washing his car with karcher and getting carried away and cleaning windows leaving baked on minerals. The amount of times I told them not to because my water is filtered etc, so this was last straw so to speak.