I have to wash down our walkway every evening, I guess since I've been doing it 10yrs it's just not hard anymore. A water fowl owners best friend besides hardware cloth is a hose.You know I started searching the internet today with the same question and all of the situations and suggestions really resonate with what has happened to my small flock mentioned in this forum.. My ducks started inhabiting my concrete patio about a week ago and now that I think about it... There is a bowl of cat food there, so I'm going to pick that up for sure. Also I remember a dog got into my yard and even went into their pen and scared them half to death. THAT was the first time they came to the patio and have been coming there every day to rest and sleep. My gate was left open and since then has been closed so no more dog incidents. I also bought a small picket fence, I'd say about a foot tall today, spend a bit of money on that and spent a lot of sweat setting it up and blocking them from getting in - so i thought- after I had it all blocked in, I look out the window and there they are back at the SAME PLACE. They jump and hop over it!
I'm going to have to hose everything down every night as part of my regimen until I can resolve this.

Welcome to BYC ps they go to what's closest to you for safety.