Do prostate drainage's really reach the entire prostate?

Looking at diagrams of the prostate there seems to be two parts. The bottom part reachable through the rectum, then it looks like the prostate continues around to the opposite side of the urethra. It seems possible that opposite side of the prostate could remain unaffected during a drainage?

Reason I ask is I feel this part of the prostate is where my problem lies. Regular drainages have helped that bottom part of the prostate, however there's always this inflammation I can feel that is more closer to the surface, if that makes any sense.

Debating on whether or not it's worth buying an actual tool made for prostate massages, if it would really be any more effective at getting that part of the prostate unclogged, as right now I just use a finger.