I have run into the same problem before. In your case it looks like glue. I keep a wet rag to wipe the glue as it gushes out.
Only thing is you almost have to wipe the entire project down or the water will change the color too.
in your case where its already done scraping seems to work better than anything i have tried.
It gets the glue off the surface and opens the pours of the wood so it will take stain.
Brent
A,B machines, PE,probe,conforming vectors, centerline, 2d,3d,stl and dfx imprt, rotary , 3.xx, Pattern Sculptor
OS X Yosemite
Woodwork is what I do to pay for my tool addiction.