Hi, after a long wait, I have received a tank cap. It was heavily used by the guy who I got it from, and I would like to clean it as best as I can.

1. It is soaked with motor oil, while it dosent drip, the stench is quite strong.
2. I dipped it in hot water and I seemed to get a lot of the oil to go out.

Now, is it wise to take it to a dry cleaner? (I removed the speakers that were in it, but it still has the rubber caps that held them in place.)
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