The Peddlers I've run across are little more aggressive. They are pedaling a service and run up to your car with a spray bottle and spray down your windshield. The next thing you know they are wiping it clean with a towel. You can wave and shake your finger no no no but they just continue their work. The next thing you know they are demanding money for their service, it's often easier just to pay.
Ach! I encountered those as well! Those are awful. You know once, we refused to pay, then they spat on the windshield and dumped dirty water on it. Man, I can't believe you have those there too. Thanks for sharing it! I wouldn't have known otherwise!