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They are permanent.
Sorry, there was a problem. Please try again later.I haven't had any problems with the numbers dissappearing however I have only had it about 2 months. I wouldn't use anything harsh when wiping down. Dawn dish soap is my go to product and I can't imagine it would damage the numbers. I would stay away from products with bleach or ammonia to be safe.
Sorry, there was a problem. Please try again later.Yes the numbers are printed.
Sorry, there was a problem. Please try again later.They rub off.
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