I have keys for any customer who has padlocked gates if they want their back windows cleaned as it saves the hassle of them remembering to unlock it for me.
If I don't have a key and they're out and I can't get around the back I just clean the front and charge a little extra for the inconvenience as it's their fault for not trusting me with a key.
I do like parts of your letter though, the part about letting them go in favour of newer, more regular, loyal customers.! I do agree you are hiding behind your letter to an extent though. Just confront your customers and tell them that you would like a key otherwise the backs get left if they forget you're coming.
Good luck with your letter approach and I would like to hear in a couple of weeks/ months time how you get on with this approach just out of interest!!!
hi easy clean and others who have made comment to talking to the customer rather than a letter,
this is not a case of hiding behind a letter as i do nor fear talking to my customers.
i believe that by using a letter they have it in writting aswell as verball, besides from january anyone who leaves the backs locked will get the letter though the letter box and i will do fronts/sides only rather than make a return trip,
i have many customers who i never see from 1 year 2 the next as i don't collect, i use prepaid envelopes.
i have 1 couple whom i have never even met, the rang me, i priced the job and was given the go ahead, monthly call and they send cheque everytime.
these are the type of people i want,
NOT TIME WASTERS