Hi all, I posted this to find out on the ways that you guys use to remove heavy rust from chipped enamelled lantern hoods. Much earlier, I've made a mistake of overrating the porcelain-enamel coatings on steel. I thought they were no different from the actual porcelain on ceramic wares, expecting they're highly resistant to acids. Therefore, I immersed a chipped and heavily rusted hood(most of the enamel were still intact) of an AFM 1967 milspec lantern in a concentrated citric acid solution for a couple of days. When I retrieved it, the previously gloss enamel surface had actually dulled and discoloured. The reason I did that was because most of the rusting was on the inner side of the hood and its hard to reach or clean out by mechanical means. I was pleased that the rust was completely removed down to the tiniest pits and crevices, but completely dismayed by the dulled hood. So guys, are there any better ways of doing this without harming the porcelain enamel?