To answer your question, I don't know how much better an expensive cleaner is over a cheaper one, because I've never useD an expensive one.
I also couldn't say YES that an ultrasonic cleaner is worth buying, I've spent years cleaning carbs on various engines and never needed one.
I do however have one of the <£100 units that I bought for one job in particular, it was a Honda carb that wouldn't idle because of a blocked airway, I'd tried the usual methods but it wasn't happening. I had been advised to try an ultrasonic cleaner with a drop of TFR or washing up liquid in it. It worked after just one 40min cycle in the cleaner.
The carbs do come out like brand new. I usually use a bit of degreaser and a brass brush on the outside just to loosen up grease and gunk before dropping them in the cleaner.
Would I be without it? I dunno.
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There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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