gunk in a finbox?

hotCheetos

OTF status
Mar 28, 2020
294
358
63
Bought this used board a couple months ago and decided to now try it as a quad. Didn't realize until I tried to fit the rear quad fin in there's some gunk in the rear of the finbox. Only a little bit but just enough so the fin doesn't fit flush. No Idea what it is or how it got there but guessing maybe it's some dripped resin from a sloppy repair or something like that. . How would I clean that one up? already tried to put some sand paper around the end of a fin key and scrape but that didn't work very well. Might just sand my fin down instead but I like to play with fin setups a lot. Any ideas
 

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stringcheese

Miki Dora status
Jun 21, 2017
4,031
3,828
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Poke at it with you buck knife. Or a bent metal paper clip if you can't find your buck knife because your car is a mess but you found a box of paper clips?