Decided to replace the fine filter assembly and along with it the lower and middle spray arm. I have tried cleaning these with a tiny brush and was able to remove some gunk out but they do not come a part so thought it best to just start with new. The filter and lower spray arm were easy to just take off and the new just fit right in. The middle spray arm part was a little different then the original. It comes with a new metal screw and washer and a plastic part that is attached to the bottom of the upper rack. You have to remove the old part that is held on by one screw and attach the new part so that the spray arm fits. Not sure why they would change it since the old set up seemed fine but you have to either take the whole upper basket off its track and out or try to work upside down. I opted to take the basket out by prying the plastic end pieces out of the track and sliding the basket out. It was an easy fix and now my dishes are clean with out a film and dirt residue left on them.