I looked at the Lyman ultrasonic and found you can buy it without the branding for less than half the money:
https://www.amazon.co.uk/gp/slredire...getName=sp_atf
Shop around, I think I paid £40.

The only thing missing is a plastic basket to keep the cases from touching the metal sides, I found one the right size. You don't really need to add anything to the water, certainly not acid. They're clean in and out after a few minutes (25 cases), longer if you put more cases in (50+). Then I let them dry overnight on an old towel. They're not polished, but I don't see any benefit unless you like displaying your ammo.