I polished with Mothers chrome polish followed with Quick Wax. It won’t pass close scrutiny but at 10 feet it’s good, depending upon seat, taillight, etc. I may be able to use it as is.
Bottom line is, the phosphoric acid solution did not do any damage to the chrome. I’ll continue to use it for less delicate things. I acquired another gas tank that’s very rusty inside. It will also be treated to phosphoric acid.