Make sure the company has been in business a long time and that they do the acid etching prior to the spraying.You can have the sink done too but honestly, I think a few bucks more for a new one will give a better impression.  

Here is a secret to get rid of it, but I recommend you doing it outdoors because the fumes will be very strong- muriatic acid - dilute 1:1 with water and scrub away. 

I am presently testing this recipe promoted on YouTube and other home repair site:-Mix equal parts sugar and boric acid powder-Place in jars or small containers near infected areasI placed my test mixture into a small petri dish and so far, haven't seen them drawn to it like some have claimed. 

Repeatedly slam your head against the wall until a slow death by being dissolved in sulfuric acid seems like a better idea.4.

Treated with professional grade products such as bait gel, growth inhibitor, bait stations, diatomacious earth, boric acid, raid, bleach in the drains, and more.

Cat pee does not go away - it's too acidic.

Sure, there are days when it takes a few Red Bulls and caffeine pills to pump you up and reinvigorate the acid in your veins.. but the end result is worth it every time. 

Sometimes though there seems to be a correlation because Drano often gets used when there is already a lot of wear-and-tear on the pipes and they are already quite thin.Some clog-removers are acidic and react with copper, but not Drano.

Here is something about using Boric acid.

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