Dump and replace Dave, dump and replace!
One of mine asked me "could you clean the UPVC frames on the front of the house" 3 windows and a door. Me, " No problem, £8 for the windows, so let's just call it £50 for the windows and pvc . Okay great. She texts me when I've finished, " the frames look great, but I thought you said £15". Sorry for the misunderstanding, but I did say £50. Still waiting to get paid, been working for her for two years. End of relationship I feel!