Will taking this apart and sanitizing it with something like hydrogen peroxide harm the tuner?

I used mild vinegar and water to remove minor corrosion and then rinsed with demineraized water to rinse the vinegar and then a wash with alcohol, definitely do not use harsh chemicals like bleach. Regular cleaning keeps the tunes bright and accurate.

Kratt Tuner products are from an authorized brand distributor in the United States.

How do I clean this without causing rust, and how do i get rid of the rust that's there?

Food grade silicone for protectant, cleaning. 320 or 400 grit sand paper for rust. Then apply liquid rust reformer with a q-tip to spots. If rust is inside it is a loss. Find a better spot to store the next one, it should not rust.

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