Endure where you can, and let him change where you can't. If you want to get along with your roommates for so many years and live in a collective environment, you must respect each other. Everyone should keep personal hygiene, and don't think that personal hygiene is their own business. In a large group, personal hygiene affects collective hygiene.
You should try to express the importance of hygiene in words. You would rather exaggerate things and let him know what kind of damage your carelessness has caused to the collective environment. Don't tell him about it alone, because you don't know him personally, in case she tells other roommates that you are trying to sow discord between them.
Sometimes he puts your words in another way, which sounds like your fault to others, so this matter must be solved together in front of all roommates, so that at least roommates can judge, and the problem of personal hygiene, that is, collective hygiene, is handed over to the collective to solve.
And you are all in the same dormitory. Even if you say these disgusting things, your roommate should know that as long as you don't tell other dormitory people, you have respected everyone. You have to know that you live in the same dormitory. You hate his disgusting place, and naturally others hate it, so let's talk about it together.
It is better to solve this problem, not only to prevent people you don't know from ruining your reputation outside, but also to solve the dormitory environment problem for everyone's sake. Naturally, no one will gossip about you, but will think that you are a very secular person.
But you have to remember that these matters concerning personal reputation are solved by collective discussion with the knowledge of everyone in a dormitory, but they only belong to your dormitory. Don't say anything to others, otherwise you will not only offend your so-called disgusting roommate, but also your other roommates will not tell you any secrets in the future, because you are a big mouth in their eyes.
Therefore, when you get along with your roommates in college, you should be tactful, and things that affect the group should be discussed and solved collectively, just like having a meeting in a dormitory. If it affects individuals, you can solve it alone, and this disgusting roommate, who destroys nature, is a health problem. You can't solve it alone, but call everyone in the dormitory to discuss it together, so as to attract his attention and let him know that you don't dislike him.