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Kind of late on this.... but you can seal cement with Thompsons Water seal...
Urine can be neutralized.
http://www.wikihow.com/Remove-Urine-Odor-from-Concrete
ammonia nutralizing
http://www.ehow.com/info_8738274_neutralizes-ammonia-smell.html
Actually that last one I prefer the instructions on.... wow what a wierd sentence....
Anyhoo it suggests cleaning then using Vinegar... Vinegar is my go to for a lot of things from sterilizing to cleaning the toilet It dissolves calcium if its not built up too heavy.
deb
Hens go broody when you don’t want them to… and won’t go broody when you do. 