That’s fucking disgusting. Even if he doesn’t regularly shower, a presumably grown-ass man should know how to properly fucking WIPE! Fucking grooossssss. I suggest you have a talk and lay down some ground rules. Wash the dishes you use, within a day of using them. Keep your dirty-ass, shit-stained laundry in your room until you are actually washing it. Keep your door closed so the aroma of your filth doesn’t flow through the rest of the place. Etc. And, of course, this is a temporary measure until you find another roommate or another place to live. This sucks and fyl, OP.

Move out, find your own place. Get a different roommate.

Maybe you should scream. Keeping your feelings to yourself isn't working out so good.