So you have issues with people knocking on your door. You have a no solicitor sigh on the door but people still come knocking. One issue may be that they just can't read the language . One language all nationalities know is wasp. Yes wasp as in Big honking wasp nest on the front porch covered in yellow jackets. Stick one of these up and I would bet door knockers will stay away. Yea I built this one.