Hi All, Looking for advice to try to stop and remove the corrosion while bringing back some of the color on this Autolite cabinet. I've seen people talk about using Muriatic Acid on white signs and it having made a major difference in restoring the finish and taking way the rust, but do you mix it? Use it straight then rinse with water? How long do you leave it on there before you wash it off? I'm afraid I'll ruin it even more.