A closer look...
So today, I informed my dad about this issue, and I removed the spray arm so we could take a closer look at it. He found out about two things. First, the metal on the bottom of the OrbitClean end had split apart, so it's grinding against the plastic on the arm.
Second, the blue plastic has partially melted. With these two issues figured out, he deduced that the spray arm is not actually spraying out of the tips, and is instead spewing water in no particular direction, like a hose that hasn't been fully attached to a sprinkler. This is what actually contributed to the arm either turning slowly or getting stuck in one spot.
When I suggested we replace the OrbitClean arm with the traditional one, my dad rejected that idea, asking "Why change the racecar's formula?" (Apparently, this is an idiom meaning to make a substantial change to something.) So he himself ordered a new OrbitClean arm from Amazon; it'll be here in a couple days.
Who knew that a split OrbitClean end resulted in such poor washing performance? It pays to take a closer look at some things. But that's OK, we have no clue just how long the spray arm has been doing this for. Once the traditional arm arrives, I might just send it back.
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