How high are your waterers?
Are they just pooping in them by roosting on them or walking around too? I have my feeder/waterer up high enough so my shortest hen can just get her head over. Any lower and they kick all kinds of crap into it.
If it's roosting and they're just sitting on blocks, maybe if you attached them to the roof by a chain it would make them more unstable and therefore less desirable to roost on? Again at the height of the shortest hen
Are they just pooping in them by roosting on them or walking around too? I have my feeder/waterer up high enough so my shortest hen can just get her head over. Any lower and they kick all kinds of crap into it.
If it's roosting and they're just sitting on blocks, maybe if you attached them to the roof by a chain it would make them more unstable and therefore less desirable to roost on? Again at the height of the shortest hen