Hey, guy welcome to the synthetic marble..
I wouldn't use steel wool or anything abrasive on it.. your wife will use abrasive words on you..
I know about this stuff, cause I used to buy the raw materials for a company that made them....
Try something like vinegar first (to break down the minerals in the water build up) .. a bleach? or try Dow scrubbing bubbles..
Brasso!
MY sister-in-law has a house cleaning business.. she said Brasso and elbow grease... What's elbow grease??
Doh! yeah I remember now..
.. let us know.. but anything abrasive will damage it...