I have the big Hornady hot tub cleaner, if that is the one you are talking about.
https://www.hornady.com/reloading/c...s-and-solutions/hornady-hot-tub-sonic-cleaner
I've not used it to put a complete upper in it yet, but you can drop smaller containers into the main compartment so you do not use up your cleaning solution when it is not needed. You can use a product like Lyman's ultrasonic lube to displace any water in an assembly. My thought is running the lube cycle is more hassle than it is worth for large parts, unless you are doing multiples at a time. I take small parts out, blow them out, and oil/lube like normal.
https://www.amazon.com/Lyman-Products-Ultrasonic-Lubricant-1-Gallon/dp/B00AU6CBH4