Public bathrooms gross me out, and I'm picky about the cleanliness in restaurants, so filth is not something I ignore either. My home/room is usually quite clean (vacuumed, dusted, wiped down, etc), just messy and cluttered.
I'm actually finicky about my appearance also. I attribute that to being a bit of a perfectionist and viewing clothing/my appearance as a form of self-expression. I don't go out in public without some effort put into my hair, clean and
real clothing on (PJs in public horrify me), and usually some makeup. I keep my body and hair clean also.
I do forget to eat when I am concentrated on something, and then all of a sudden I feel weak and realize it's been 6 hours since I've eaten anything. I also forget to drink water, but I am better about that than eating. Sleeping may be put off if I am in the middle of something I do not want to stop doing. I ignore symptoms of illness and may go a long time without realizing something is wrong (ie. I have acid reflux and for years ignored burning in my throat until my esophagus got so raw I couldn't swallow).
I am bad about keeping a schedule. Having a 9-5 job benefits me in that it forces structure on me. When I was self-employed and lived alone, my sleep schedule was all over the place (3am to noon, 4pm to 8pm long naps, etc), I'd eat whenever I felt like it (2am runs to the store for bagels for breakfast), and clean whenever I had energy (vacuuming at midnight), and work when the creative mood stuck me. Basically, I am a night person and I was naturally falling into that while still realizing I had to be up in the day to communicate with people.
Part of me loved it and a part of me saw the chaos as not being something I could sustain longterm. I dropped weight and was a bit depressed. I formed a newfound appreciation for structure and routine. I'm still not exactly "scheduled", but I try and give myself valid reasons to go to sleep/wake up at similar times every day, and that sort of thing, so I have some kind of stability in my everyday life.