A few years ago, somebody I know made the mistake of letting Mormons into his house. You'd think he'd adopted them. They were round his house three or four times a week for hours at a time. This went on for a few weeks, with him dropping subtle hints to try and get them to stop, but to no avail. Eventually, he lost the plot, gave them dog's abuse and threw them out the house.
To make sure they got the message, he put a sign on his door.
No hawkers, no Jehovah's and definitely NO MORMONS! Any found knocking on this door will be told to FUCK OFF!!
They never came back.