How to shine an old porcelain sink?
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I would get some Gel Gloss... https://www.amazon.com/Original-Gel-Gloss-Kitchen-Polish-Protector/dp/B000LNQ83O/ref=sr_1_2?ie=UTF8&qid=1534479676&sr=8-2&keywords=gel+gloss+cleaner+and+polish they have it at Walmart too
I use Barkeepers Friend and works pretty good.
Toilet bowl cleaner. Let soak for 20 minutes and scrub. Sparking clean.