I have scooped as much of the slimey rubbish out of the sump by hand as I can but as it goes under the column there is zero access. I going to raise the whole machine at some point so I'm considering pouring a few litres of paraffin or similar into the sump and leaving it for a while then see what drains out the drain point since I will then have access to it.
My V2 seems to have three seperate chambers in the base. The front two are easy to acces through the filler and pump holes. The rear has the drain on it and also seems to have an access hole under the motor in the rear. I haven't taken the motor to see how big it is yet though!