>>2151883I thought I ruined my pipe with alcohol at first, but it was just the oxidation as other anon said. Just a new experience
>>2151961Pic related. No name on the cup, I'm not sure from where I got this. "Water based cleaning and polishing paste for metals, plastic and dirty glass"
>>2151997Thanks. They say it's made of ebonite, vulcanized rubber, so from what I learnt some abrasive and oil/wax should do the work easy