Comp overheated and Clavus 68

[Grizzly]

Hi Guys
For the last couple of days.
My colleague and I have been stripping and inspecting a very large 8 cylinder recip.
This is on a NH3 system.
Historically there has been a problem where the discharge valves have failed.
Resulting in the compressor seriously overheating.
Leaving the comp full of that familiar black carbonised oil / residue.

Now I am sure that there are plenty of guys out there that have been there?

My question is in these politically correct times!

What chemicals does anyone use to clean out a compressor full of this gunk?

I was thinking of using Paraffin cloths and elbow grease?
Is there anything newer on the market that anyone has used?
Cheers for any advise in advance.
Grizzly