Our bathroom sink has a rubbery membrane over the overflow drain. How do you remove it?

Answer 1

Is the sink a new one? The membrane may be a protective film that manufacturers put on chrome or plated grates. If so you can peel it off with your fingernails. Water going into the overflow will go down the regular drain, not into the woodwork etc. below.

Answer 2

You're not supposed to, ma'am, that's there for a reason, to prevent moisture, or greater amounts of water from leaking into the wood work below..... Damaging or corroding whatever you might have down there, aswell.