If you are talking about cleaning the part in the red square, just unscrew it and pull it out. Should be an 18mm socket.
That's the part that makes the spark that ignites the air/fuel mixture. It can be cleaned in a small variety of ways. I've used some fine emery cloth followed by a shot of brake parts cleaner to remove residue. Careful of your eyes. And wear gloves.
Be careful threading the spark plugs back in. Don't cross-thread them. Very bad.
Do it by hand, or with just the socket, and possibly an extension, on them and no handle. If they thread in that way with no resistance they can then be tightened up with the handle. If you don't have a torque wrench, tighten them until they seat, and then about another eighth of a turn. But get a torque wrench.
Did I say to get a torque wrench?
I did clear those parts and gonna leave that out of car for all night to "drain" all the liquid if some left inside just to be safe
+ the cable in the engine that plugs in that connector i did also cleared
I got this cleaner special for contacts cleaning
and gonna use that as well on the spark plugs,
i did buy special spark plug removing wrench today, so i think remove and install wont be any problem, also I`m disconnecting the battery before removing anything
maybe i wrote something incorrectly,
do this part in red square touches something inside engine? is there some connector or it just "hangs in the air" down there and it not connects to anything?