Namely, spray with degreaser, wait, and then pressure - wash it until the housing was nice and clean. (fourwheeler.com)
Every time they change my oil, they will just shoot some engine degreaser on that area and clean it for me at every service, so that holds off the smell for most of the time. (mechanics.stackexchange.com)
I agree that the general principles of bicycle and motorcycle chain maintenance are similar but I'm specifically concerned with the chemical effects of degreasers on o - rings and not convinced that bicycle chain cleaners need to worry about this. (mechanics.stackexchange.com)