How do I remove marks from suction cups from my picture window?

Have you tried vinegar?

Hello Mel! Can you tell us what cleaning products you have already used? That will be helpful in figuring out a solution to your problem.

I have tried vinegar. Maybe rubbing alcohol or a magic eraser would do the trick. I’m reluctant to try something abrasive. The mark doesn’t appear to be raised. It’s more of a residue from the suction cup.

I clean my glass shower doors with Cerama Bryte. It works great.

I would use white non-abrasive toothpaste on a moistened soft cloth to remove the debris left from the suction cups on your picture window. Rub in a circular motion, then wipe with clean moist cloth and dry. You may need to repeat 2-3 times but feel sure it will work.