Need help here guys

Hey fellas,we service a busy rest area out on a major interstate (I65) and the piss from the urinals petrifys in the pipes and in the fixtures themselves,I’m trying to come up with a way to clean the urinal traps and behind them without pulling them off the wall,any ideas?.??

Ps,chemicals won’t work as they are never shut down at all,they run 24-7 365 days a year

These are American standard urinals from back around 2002

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