Gross - cleaning skimmer cup

[Reef Pilot]

Further to the stinky skimmer goo.... I can handle cleaning my skimmer cup from time to time, but what I don't like is having a bit of that same smell in my sump room, coming from the milk jug where I collect the overflow from my skimmer cup. I empty and clean it about once a week, but the smell starts almost immediately.

I think it is because I have a beckett skimmer that draws a lot of air, which ends up being pushed through the skimmer cup and out through my milk jug.

Any ideas on how to reduce this smell? Can't plug anything, as the air has to go somewhere. It would be nice to vent it outside, but that is not practical with the location of my sump room.

I thought of maybe saving my spent carbon and putting it in the bottom of my milk jug. Not sure if it would absorb the smell or not. In any case, would have to throw it out or wash it regularly, and don't have enough spent carbon to support that anyway.