The seal on your master cylinder let go and every time you press the brake, a bit more fluid squirts past and into the booster housing. Replacing the MS will cure that.
To get it out of the booster, a syringe or turkey baster can be used for the majority of it, then a swab in some kind of suitable holder (like mabe a rifle bore patch eye perhaps) to get as much residue as you can access.
The drier you can get it the better as it'll eventually put the rot to the diaphram, which won't cause a brake failure, but will cost you the vacuum assist and make the brake pedal really hard. It'll also create a vacuum/false air leak when it goes.
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