Welcome, jhonwoo. Please give us a first name to use.
I think you'll find your "cultured marble" surround is actually a cast polymer of some sort, with a clear coating much closer to fiberglass than to any kind of stone. I'd look for cleaners that indicate they're safe for fiberglass.
My opinion; worth price charged.
Welcome also, sunyhere. Please add a first name to that signature line for us. Might wanna come on over to the Professionals' Hangout and start a thread to give all the folks some professional background. We're always interested in new help, 'specially here in the Restoration forum.