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What does the TM say about cleaning/maintaining the Unit?
Usually the Maintenence/Repair Proceedure Manual says something to the effect; "Use Cleaner NSN: 123abc or equivalent, Do not use Solvents/Cleaners that contain XYZ."
It'd make it easier if you'd post the year and model of truck you have.
When trying to disassemble the Valve try to fine a solvent/cleaner that will break down the dirt/corrosion and not hurt the Valve or the medium that the Valve controls, (I.e. oil, water, fuel etc).
The Solvent also needs...