@Mitsche I would recommend staying away from the rice trick, it does not help. Here Is a post on iFixit that may help.
https://www.ifixit.com/Wiki/Don't_Put_Your_Device_in_Rice._Here's_Why…
As for opening it. It may end up being destructive, and not worth it. There’s a good chance it will work fine and no liquid got inside. Blow into the edges of the ports to blow out the liquid, and then try giving it some good ol love taps to be sure it all out.
In other news, I recall watching a video some time ago about a person? couple? driving from the US to the southern tip of South America and that their laptop power adapter died and would cost an arm and a leg to get a new one, but there were local electricians that could fix it for almost nothing. I can’t find the video but I did find one of a person checking power adapters and opening them up.
Plug it in and if you have something you don’t care about that is USB C try charging that first with the power adapter before you plug your sweet Framework into it.