Stainless Steel Sink issue?

All resturant supplyers and used dealers use muratic acid, you may have to buy a few gallons and let it soak. Its cheap and at all home stores even wall mart just pour it in and let it work make sure to where protection (glasses and gloves) and ventilate the area it will have a strong oder but will clean any stainlees to a brilliant shine. unless you have a cheap coated stainless. it works.

Congratulations...You have permanently anodized your sink. You created an electrical field, with the right acids to anodize stainless.

Use Fine sandpaper, used to Wet Sand auto paint finish- I use it to clean my Stainless pots.

Look up the Queen of Clean on the web. She has cleaning tips for all sorts of things.

Use braaso it works great to remove stains

hope you can buy wash power, mix with sugar granules into a paste, rub on and dry with a clean dry cloth

Chnces are it's too far gone to save........ 3 days of exposure to Tarnx, is very damaging

i'm afraid it is there forever. you might try filling your sink up with bleach water and let it set for a few days.

use brasso polish to remove tarnish from copper

if it set that long you will most likely just have to live with the stain!