Does anybody know how to get corrosion off of a Sony WM-10?

Baking soda or bicarbonate of soda (sodium bicarbonate) will shift some of that white crusty stuff. However most of the anodised paint will have been lost as a result of the chemical reaction, so alas it will never look as good as new in the end.

Mix up a slightly thick paste of finely granulated baking soda with water and let it sit on the corrosion for several minutes and then gently brush off under running water. Repeat until you can shift no more of the white crusty oxide.

You may want to fully dis-assemble the unit first before trying it.

My unlucky WM-W800 is in this category too, waiting for better times (which are coming!)...

No corrosion on the outside (plastic housing, luckily), but mostly on the internal metal plate.

Came with original (made in USA), 20+ years old leaky Duracell batteries...

That sucks fortexg, my WM-W800 is band new, still in box, never been used.

Wow, nice! Much cooler than mine...

And your batteries did not leak

With well preserved 'COMPLETE' boxed specimens...the keyword is YET !!

batteries have not leaked....YET

Folks please toss those batteries aside into a separate zip locked pouch or something...they are nothing but OEM batteries with a Sony sticker on them in most instances and they cause almo9st irreparable damage when they start leaking inside a mint NOS box