I am assuming you are referring to a MB 4 or 5 cylinder..
Yes, they are not even too hard to get out ( from the top )... and are supposed to be cleaned on a regular basis... they are critical to good fuel mileage. They have about 7 small holes at various angles and the warnings are like any precision hole cleaning... don't run something like a drill bit into them... soaking in cleaner and that sort of thing is the ticket....
Two types of remover are available... and I have read that the much cheaper one which mounts to a hand impact remover generally works fine. The more expensive screw type may be needed in hard cases.

PS.
BE SURE TO REMOVE THE GLOWPLUGS BEFORE REMOVING THE PRECOMBUSTION CHAMBERS......