Wet residue could mean that your filter is clogged or the grind settings were too fine. Run a filter flush and/or a clean shot in the App.
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Alternatively, it may be a clogged spout - If you look closely at the spout, you'll see a cross shaped divider splitting it into four holes. Using a needle or paperclip, poke each of those holes and give them a bit of a stirring motion. Then a clean shot or two from the app (same menu as cleaning) should flush any debris out.

Should you need any help, please reach out to the Spinn Support team - we are here for you Monday - Friday: 9:00 am - 5:00 pm PST. Click on the chat bubble in the bottom right hand corner of this screen.