There are various environmental issues to take care of when restoring classic Mini engines...
When we perform an engine cleaning, there is always some amount of "ick" that comes off. Yesterday we had the "sludge guy" come in and remove said "ick"... to the tune of four full-to-the-top 55 gallon drums (it's been a while since we last did this). This material is disposed of in a environmentally safe manner, rather than dumped down a drain.
Steve assists with sludge suckage
Four full 55 gallon drums were hauled away
This is as close as I wanted to get...