How best to wash and cleana screw compressor onsite

I have numerous screw compressors in my factory. We wipe down the components and blow out the coolers, but due to our manufacturing process and oil leaks within the machines they are still quite dirty. They are also quite large and so uplifting them is a problem. What is the best way to wash them onsite. Unfortunately we inherited the compressor room so there is no drainage.

Any help or ideas would be most welcome.

_______________________
Bill says...

I would have opted for pressure wash, but no drains makes that a problem.

Anyone else have any ideas?


Bill