Beat way to preserve old "Patina"

[Stitch]

I'm doing this right now with the CLR to my truck and when I finish the process I will wet sand and clear the truck...I will tell you it is a slow process...If you look at my farm truck build in my signature you can see what I've done so far to my hood...that's after about 3 hours total on two different days washing the hood with CLR...