Flushing/cleaning coolant reservoir?

[speedofsound]

Hello all,

We've had our MB18 for a little while now, and plan to start cutting some 6061 for a few projects. One thing noticed was the coolant was pretty nasty when we tested the flood function. We pumped out the tank and flushed about 20 gallons of water through it (fill/drain/repeat).

Is there a good way to clean the tank more effectively? If it's in the manual, just tell me it's in the manual. I don't have it handy at the moment.

thanks,

Alan