yep, when ive done it, ive wrote a letter, photocopied how many houses there are, then took the new cleaner round to meet them, if theyre not in i stick one thoughr letter box, and if they are i explain to them and give them a letter.
something along the lines are
thank you very much for your custom in the past years. i have picked up alot of work and i can no longer get round everyone in time so MR X well be looking after you. thank you again for your custom.