there's probably a thread here or on e30tech about cleaning injectors. they're easy to take out, just soak them in some injector cleaner, maybe?
if your gonna go that far, just buy a set of S50 injectors (19lb) already cleaned + flowtested. i did that with my car, and immediately noticed a difference. car pulls way harder, and seems to rev easier and idle smoother.
when i took out my old injectors, they had a lot of crud around the edge, but the port itself was super clean. so they werent clogged.