[Radio Wrangler]

It's a multistage process.

A volatile solvent will be good for softening greasy gunge, and the run-off will carry some of the muck away, but not all. The grease dissolved in the solvent that remains to evaporate off of the chassis will be left behind by the evaporating solvent. But that leaves it greatly reduced and more amenable to a second go with a detergent which will chemically bind to the grease and render it water soluble for a final wash.

Acetone will dissolve some plastics (and polystyrene capacitors) and will take painted markings and coloured bands off of components.

Remember that it's liquid runoff that takes the unwanted grease away. Anyting evaporating off is just the solvent distilling off and leaving the unwanted material behind. This is why commercial degreasing baths work quite well. A garage workshop may be a better bet than the jet wash on the forecourt.

There are good degreaser detergent/kerosene mixtures like 'Gunk' and 'Jizer' (not to be confused with Tizer)

For cleaning electronics, I usually use lots of IPA followed by Electrolube foam cleaner.

David