Trust me, people can smell REALLY fucking bad. As
@Big Nasty mentioned, Mallgoth made Phil take a shower as a condition in letting him stay with her. Even afterwards Phil still stank. When someone is perpetually filthy (which is why we sometimes call him Philthy or Land Phil) and rarely showers, the stank gets into everything they own, wear, and even permeates their skin and they continue to stink until they've bathed regularly for a while. Phil almost never bathes, often wears leather or vinyl clothing and boots, rarely changes his socks or even removes his boots, and he shits himself and doesn't wipe. Add into the mix a poor diet fully of greasy and fatty foods and you've got a recipe for one stank-ass person. I've run into people with similar personal hygiene habits who weren't homeless and it can honestly be very unpleasant to the point of it being nauseating. It's similar to how you can tell if someone owns a cat and doesn't change the litter box often, someone lives with a smoker while not smoking themselves yet still stinks like ciggies, or how old people in nursing homes have a certain smell.