So like I said, at this point I could remove and return each plastic (and the rear part of the ramp, and The Juggler) individually to clean under each one and replace rubbers. It might have been satisfying to break it all the way down to a completely clean playfield, but this way there aren’t more and more parts organized on the floor to confuse the project, and the end result is the same. I started on the left with the large red plastic, and here is a pic.
After doing the job from left to right, all that was left was to return all the parts that were organized on the floor. Finally, here it is fully reassembled and running.