As long as it makes it out to the public sewer most people don't give a damn.Make sure no one is pouring GREASE down the drain.
I don't care if you wash it down with hot water. The water gets cold REAL FAST.
You just make the grease solidify further down the pipe.
I'm on a well & septic so I make sure that grease does not go into our system. Quick way to clog up a septic system is with grease.