Cleaning old unused hydraulic lifters

I have some sets of new hyd lifters that I got around 40 years ago and let sit during the 30 years my car hobby was dormant during my busy work years. I have put together two hyd motors using the old lifters in last two years with the old unused lifters.

They were really gummed up inside when I checked them. Took them apart and had bang some on a block of wood to get the plungers out and cleaned with Brakeclean. Oiled with light oil and made sure plungers free, both new motors run fine. Took a couple hours to clean and reassemble a set; hey, I'm retired now, and determined to use these parts I've been storing for years.