I've been living on the West Side for five years, tried a couple mobile detailers and haven't found anybody that I really liked. But Golden Hammer Auto Body on Butler (South of Olympic) is a first rate repair shop that primarily works on high end cars (Ps, Fs, RRs, etc). I don't know if they also do detailing. But if not they will be able to point you in the right direction. The number is (310) 479-4311. Let me know what you find out.

Also, a friend once recommended the car wash on Sepulveda just south of Sports Club LA. Appearantly, they also do hand wash and detail. I've ran my P car though their automated car wash (I know that's bad) and not had a problem. I've not used them for detailing because I think they handle too many cars and I prefer a service with more personal attention that only does detailing.