Ooppss.. welcome to beautiful black porcelain..
How to Remove Scratches in Black Porcelain Sink eHow
Fine scratches on Kohler sink
How to Make My Black Porcelain Sink Shiny eHow
Kohler Kitchen sink scratch repair
SOURCE: Surface scratches in my black bathroom sinks
You might try a vehicle buffer on them. If that doesn't work you will probably have to use a porcelain touch up kit that can be bought at your local hardware store.
SOURCE: Black Sink - white haze
A lot of the soaps and things that we put into our sinks can cause tiny scratches into the glaze. That's what is causing the "haze" you are describing. It's not something that can be lifted off but might be buffed out. I would recommend contacting Kohler and asking if the sink can be buffed successfully. They may be able to give you some contact numbers of people that can repair the sink if it can be. I wish I could offer some more advice but you might be heading towards a replacement instead. Good luck to you!
SOURCE: how to maintain cleaning and scratch free
Using soft scrub or some brand similar is the best thing to use. Manufacturers reccomend only soap and water, but soft scrub is best. Be sure to never use abrasives on any fixture, it will scratch and void warranty
Kohler makes a cleaning agent for cast iron sinks, if this is what you have.
hope this helps
Put on rubber gloves. Spray the sink with a nonabrasive commercial kitchen cleaner, covering all surfaces of the sink with the spray.
Dampen a sponge in warm water. Wipe the sponge over the sink, scrubbing at any visible dirt.
Rinse the sink with warm water and then dry it with a clean towel.
Fill the sink with warm water and add 1 tsp. of chlorine bleach per gallon of water, once a month. This will sanitize the sink, and is recommended by Thermocast. Let the bleach-water mixture remain in the sink for 15 minutes, then drain the sink. Rinse.
Apply liquid automotive polish to a clean, soft cloth. Wipe the cloth over the sink to remove any scratches that may have occurred. Buff the sink using a circular motion. Rinse.
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