Hmm...I remember seeing some rust remover or something like that at Ace Hardware
Never heard of Sorextx. Even name brands like Franke, Teka, etc also scared. Nowadays stainless steel cannot be trusted
Just hope for the best.

did the bolded part 

just installed and used less than a week, found out some little 'mini-rusty-like' spots on the sink, scare it will spread more in future.. bought branded sorextx some more told me 304 stainless steel bla bla.. look like complain to seller even if they willing to replace also no use liao.. really farked

if use strong chemical wash remove the spots scare even worse.. haiii