Also to get them to clean up what they have spilled don't put anything in the pan. They will scratch around and look for it. If you are worried about them not having anything in the pan, just put a little bit in there, and then check on them throughout the day.
A lot of times, I will feed them, they make the mad dash to the feed, then a few minutes later the are wandering off to scratch around the yard.
Two days ago I put some scratch in last years tomato patch, I wanted them to work the soil, I did this while they were watching.
They didn't eat it that day but the next morning I let them out and then started feeding them, when I came out with their food they were in the tomato patch, cleaning it up.
A lot of times, I will feed them, they make the mad dash to the feed, then a few minutes later the are wandering off to scratch around the yard.

Two days ago I put some scratch in last years tomato patch, I wanted them to work the soil, I did this while they were watching.
They didn't eat it that day but the next morning I let them out and then started feeding them, when I came out with their food they were in the tomato patch, cleaning it up.