I found this posted in a Dutch home recently. Seriously - in their downstairs bathroom.
After you make a large delivery, kindly look to see if you left any tell-tale signs (literally "tracks", as in railroad tracks), and kindly clean them up. It makes it so much nicer for the next person.
Ah, Dutch candor. Sometimes, I just have to smile. And, of course, catch a snapshot on my phone. :-) I suppose it must be said that this family has three young adult sons, so that might have something to do with it.