How to get suction cup rings off of the inside of a fish tank?

I just reset my tank up, I moved. And the back of the tank is now the front. I already got the water and gravel in when I saw the spots. How can I get those off. I have underwater lighting and a hood, and you can really see it.

Thanks,

TLE
I used razor blade for the top of the tank did not think about that. Will try that. Thanks,

I really did not want to have to empty to get that off.

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