Originally Posted by AtomicNo13
Using a wax or other sealant isn't a good idea.
Not sure I would completely agree, with over 15 years using various cleaners (and waxes). Mine looks like it did the day it was placed into the RV back in late 2003 when it was built.
Also partially disagree about the bleach, unless it was poured in full strength.
Keep in mind that a higher than normal percentage (even higher if you do the shorter contact time method as I do) of bleach is passed through the water systems (and comes in contact with the sink) as part of disinfecting the water supply system. Although at a significantly less concentration than just pouring it in from the "Clorox" bottle, again, after a bit more than 15 years, I would think that given these comments about bleaches and sealants, my identical sink would have exhibited a similar issue- but it hasn't, yet.
I would have to agree that it's most likely a bad batch, inferior grade of stainless steel, someone poured something really nasty in it (heavy duty drain cleaner?!) or I, like many have just been lucky for the past 15+ years.