People do not like solicitors. Especially as more people become less interested in social interaction because of technology. They don’t like door-to-door salespeople.
A funny e-commerce company that uses its brand to buy its way into homes. Sell no soliciting signs online. You could have all sorts of types and brands of no-soliciting signs. The reason the business would work is mostly because of the marketing and brand. You could make it silly and interesting.
“Where pest control meets real pest control.” - with a great photo illustrating how your sign keeps salesmen away.