I put the very rusty parts in the evaporust for a couple hours then scotchbrite the surfaces. If something is being stubborn wire brush. Once the bulk is off I have another plastic bin that I fill with more evaporust and submerge it in the ultrasonic heat it all up to 45c. The ultrasonic waves go right through the plastic and into the the bin with the evaporust. Let it run for 30 min. take it out blow it off. At that point its pretty dang clean. If its something like a floating tap holder I’ll oil the moving parts otherwise just wipe off and blow dry. I was concerned about rust coming back quickly but I have a piece of steel that I have been “testing” for about 9 months sitting in the shop and it has yet for rust to come back.