Baboon in the house!

I reached home about 4.30 and i was pissed to see that the water in the bathtub was smeared by some kind of substance that will make you itch. I knew that the new tenant was the culprit behind this because one of the hsemates had already told me earlier and asked me to be cautious in case if the water turns yellowish again. So i wasted my time cleaning up the bathtub and filling it up with water. It consumes energy and thats why i was extremely hungry after i had done cleaning and pasting up some warning notices on the wall in and outside the bathroom. And sometimes they dont even bothered to check if they had cleaned up their unpleasant mess right after they finished dealing with the toilet bowl! It makes me sick to have such housemates, even animals can be trained to follow rules, shame on them!