Cleaning a Pyrex dish lid

We can see the mold. In my experience, the seals have been removable, but on this one, it doesn’t seem so, and I don’t want to force it.

How should I deal with this?

I would soak in peroxide and scrub with an (old) toothbrush, see if that cleans it out.
But I might also let it go and replace it with something easier to clean.

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In addition to what @grumpyspatient said, I might try sprinkling a little baking soda on it before using the toothbrush.

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Same, 100 percent. That is my move, too.

Buy a new Pyrex container.

You can buy replacement Pyrex lids. Do a search, etc. YMMV.