Dear Miss Muffet,
As this is the second time you have turned a worker away (last time being when the gutters needed cleaning but you said no because incy wincey spider was living in the downpipe) I'm afraid I need to ask you to sit on your tuffet and eat your curds and whey - whatever they are - before I can clean your windows ever again.
Your sincerely,
King of the spiders.