To throw out some info, In cleaning machine tools I have used mineral spirits (paint thinner)with some success but it is a mild and slow solvent, I find Naphtha more aggressive but still will not remove the paint, don't think I would use it in a washer though.
For water based where items can be dried before rust issues, I just tried Zep (at HD) citrus degreaser on painted items with success. But for the ultimate, try Zep "Purple Degreaser", at full strength you will be amazed, but do not use on paint (it will strip it right off) and do not use on aluminum (it will eat/etch instantly).
Do use gloves and eye protection.
I built a large sink to wash parts with water based degreaser and have good results washing and rinsing with hot water, the heated parts dry fast enough to beat most "flash rust".

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