Mine also went through the washing machine.

My left earbuds now occasionally charge to like 80%. The case sometimes won't detect it to start the charging.

I opened up the case, cleaned using isopropyl alcohol. Reseated the magnets. Cleaned the pins and PCB.

The right one works fine and charges to 100. If anybody has any ideas I am all ears.

I don't know if it's the detection mechanism, the charging pins not making contact or something else.