Yes, you can soak it. It should remove some of the dirt. I'd suggest doing at least 2 rounds of soaking for at least 24 hrs each time. Make sure you change the water 2-4 times a day. As you pour out the old water, you'll notice it's a little brown from the removed dirt/stains. Good luck and show us how the card turned out.
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T206 518/518
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