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To be fair, if all the windows have that tape residue to be removed, it could be an all day job or longer, Ive never had a similar so cant be sure. Maybe time how long it takes to do a small bit and then multiply it. Maybe explain that future cleans would only be £x (whatever your hourly rate is, say £35/£40 )To clarify, the frames are uPVC rather than wood.
Can anyone suggest a price?