Waymos are killing my business

I am a professional windshield washer downtown, and the recent rise of Waymos has been rough on my business.

With no driver inside to flash a gun at me, I have a very high rate of completing step 1 (washing the windshield), but then when it comes time to extort them for money there's nobody there!

Any ideas? Should I start asking the passengers? I am afraid they only have crypto and will try to talk to me about their podcasts...