How do you refer to these circles by tea cups? Suppose, I want to say an office boy, how should I say it precisely. I'm stuck because I don't want to call it as 'spilled' tea. Nor do I refer them to drops of tea. Those are tea rings by mugs/cups. Are they stains....so clean this tea cup stains? Cup stains?
Hey, could you please clean this _________________?
I'm talking about this
Is there any term for that? How do natives say this?