Stench and conversation

Got off the train and the stench caused a lot of groans and conversation amongst those of us waiting for the lift. We all agreed it wouldn't happen in a trendy suburb. Told one woman I started a blog and she suggested I put notices on the car windows. It's tempting, but I know how annoying it is for some when they come back to the car and find a note under the wipers. I don't think I can do that! Maybe I can make up cards and every time I have a conversation (nearly every time it comes across the station) I can hand them out. What do you reckon?