Use Once Only Mouse Trap

Have you ever wonder why your mouse trap can catch only one rat/mouse? After that, the mice seem to be smarter to know that the trap is a danger to them!
We were told by expert yesterday that we must wash the trap with hot followed by cold water after every successful catch. He told us that when a mouse was trapped, it will go into distress and will urinate around the trap to warn other potential victim. That is why other mice will keep away from the trap.