Several older threads on Evaporust but this is the most recent and I didn't want to start another so....
Just got around to trying this product and am pretty impressed so far.
Was at an estate sale recently and went "full-digger" mode in a tiny little log cabin/shed (maybe 10x15x5 high). 100 degrees out and shin-deep "tetanus-in-waiting" everywhere but I pulled a stack of old license plates out of the piles.
Top-to-bottom:
As found.
9 hours soaking.
2 hours soaking.
As you can see the Evaporust works but the longer it soaks the more it apparently attacks rust under the paint and lifts it too. Not an issue if you are fully restoring the part but I want to preserve some of these so I'm playing with soak times. Side note: it did not change the color. The white paint appeared on the middle plate after the first hour. At 3 hours I still wanted more rust off so I left it overnight as a test. Idaho must've changed plate colors between years/counties/etc. I'll know more as I continue cleaning them up. I got about 8...mostly consecutive years.