i am no longer doing one of my projects, and ive detached from all my clients,
however it still is shown in my boincstats
will it go away, or can i get it removed from my list?
or will it stay forever because its credit goes toward my total?

It will stay in your list, cause it goes towards your total. If you want it removed, you could change your email address, so you'll get a different CPID, but I wouldn't recommend this as your total will be incorrect.