My daughter/Brown Owl works for Scottish Power, formerly MANWEB, in the office at Warrington. She thinks all the salesmen should be shot!
I made my own sticker, printed it off in very large red letters and stuck it on the porch door. It says,
NO Salesmen, Reps, Lottery canvassers, Random charity collectors. If we haven't got it - we don't want it.
On the odd occasion when one of the above still rings my doorbell I don't say anything, hand them a bundle of junk mail, leaflets etc., which tends to accumulate in the porch, and shut the door.
