Hi Guys.
Long story cut short.
A customers plant was due to have been shutdown 2 weeks ago. When his new plant was due to go online.
Therefore probably for the last couple of years "We" have been fire fighting only, with an absolute minimum of maintenance being paid for!

Anyway his plant has 6 sets of plates which have hot gas injected into them at the end of a freeze cycle, using Pm valves.
These in the past have clagged up with mineral oil and started malfunctioning.
Resulting in them having to either be replaced or latterly stripped and cleaned before being put back online.
Has anyone come across some form of cleaner we could wash these valves in situ with?
We literally only have to keep the plant going short term.
So there is no hassle with the long term contamination.
Parts are subject to say -15c to + 30c approx.

Thanks Grizzly
PS. An oil drain is not an option!