This is the one I have...
Ultrasonic Cleaner - 2.5 Liter
A little bit more pricey than the HF one you linked but it's larger and works nicely. I did all five of my injectors with it and it worked great. I put some gas in a small container and then floated that in water in the ultrasonic cleaner. Didn't want to put fuel in the ultrasonic cleaner in case my wife wants to clean her rings or something.
I used a small brush and some gas to brush them off a little bit then let the ultrasonic cleaner do the rest.