Not really OCDs but more of a thing I HAVE to do - I have to use the big knifes and forks at home. I refuse to eat anything withe the smaller ones. 100% I wont touch the smaller knifes and forks.
I won't go out of the house (my house) on a morning without a shower, if I don't have a shower I don't go out. Simple.
If I notice a spec of dust/dirt on a table I will wipe it off, then i'll notice another spec close by so i'll wipe that off too, rinse and repeat and in the end I usually just get my sleeve and wipe the whole surface.