I never heard of Evapo Rust until I read this thread. Picked up a gallon the other day and tried it out on some used Lyman dies I bought on Ebay several years ago. I tried cleaning the dies after I bought them, but gave up- the knurled parts resisted all my attempts to clean them. I read on the net that it works much faster in an ultrasonic cleaner, so I dug out my Hornady sonic cleaner (I stopped using it when I started wet tumbling). After a couple of 8 minute cycles in the cleaner, all the rust was gone and the dies look almost new. Encouraged, I dumped all my shellholders into the cleaner and repeated the process, following up with a tumble in Lemi shine and Armorall. What little rust was on them was gone and they looked much better. It also works great on rusted bolts, tools, etc. I decided to keep the cleaner loaded with ER on one of my benches so it will handy for use with any rusted parts I come across when working around the house.
Many thanks to ray15 and the others who posted about ER. This is the greatest benefit of this forum on THR- I regularly get very helpful tips from reading these threads, even when I don't have anything helpful to contribute.