Wonderful! I don't have access to an ultrasonic cleaner but I can definitely spend the time for a few rounds of soaking and scrubbing... though I suppose that won't really get the tiny/interior parts...

Thanks for the note on the bowl (which seems to be built into the gas tank on this model) It definitely is rusty and grimy (which leads to debris that can block up the jet as well right?) And I hadn't even thought of that possibility of the gas just leaking out! However, I just looked online and it seems like the tank is no longer available..... Maybe I'll just try cleaning everything super well, test for leaking in the bowl and see where it gets me. Any suggestions on how to approach finding a reliable(ish) knock-off if it comes to that?