I use a food dehydrator with adjustable temperature as my brooder so I use the food trays with shelf liner over them. To clean up, I remove a tray and replace it with a clean one. I take the dirty tray to the bathtub and I use the handheld showerhead to spray them off. I soak the shelf liners in antibacterial dish soap before reusing them. Under the dehydrator trays I have ice cube trays to contain what goes through the shelf liner and the mesh of the trays. I feed wet food so any that spills gets squished down below along with the duck poop and ends up drying out. I rinse out the dried deposits in the ice cube trays with water and wash them with antibacterial dish soap.
While I clean the trays, the ducklings take a bath. I use a plastic paint tray ($1.50 at Goodwill) as a duckling pond because it has a ramp that prevents any ducklings from drowning. The paint tray is in a plastic tub with a shelf liner so when the ducklings are done with their swim they can dry out on the shelf liner. I get a roll of the shelf liners for $1 at the Dollar Tree but I am able to keep using the same pieces by rinsing and washing them.