Well, since we don't know what you bought, I'll share my experience and findings. Bought a Hornady Magnum sonic cleaner a couple months ago, along with a quart of their brass cleaner concentrate. The stuff plain works in this large sonic cleaner with two transducers and a good heater that goes above 120 degrees F. I can make no claims to how it may perform in the smaller capacity cleaners with only a single transducer and no way to heat the water.
I have also found that nothing more than plain hot water, a good squeez of Dawn dish soap, and a 9mm case full of Lemishine from Walmart does just as good as the Hornady stuff. I also reuse the fluid at least 4 times with good results. The Magnum cleaner will hold lots of brass in the basket, but the more you put in, the longer the cleaning cycles will be. What's nice about this one is that I'm not limited to 480 second cycles, I can set it to run for an hour without stopping.
Go the the Mid South Shooters Supply YouTube page and find the videos they did to compare the home-made brass cleaning recipies from Kool-Aid on up. Interesting stuff.