Discovered by Scrooge, AF metal polish with fine grade wet and dry works wonders on ST/ST end cans, cut as well as wire wool but with far better finishing down, almost comparable to metal polish with a MF.
once cleaned up, I wiped down the end can and link pipe with eraser / IPA and coated with GTechniq C1/C4/C5 which ever I had, and topped with reload once cured to help with water spotting. Has been fine ever since, shiny scorpion oval now doesn't say 'not for road use' anymore