I use water based rust converters on used cars/projects then fish oil after its dry
First make sure all the dirt is washed out of the cavities- chassis, firewall, doors using a hose or high pressure lance squirting into chassis holes, door drains, front top hinge bolt holes. Strip door skins if necessary.
My 2 tricks are using a 'kero/parts washer' gun and spraying rust convertor into all cavities until it runs out( following the natural path of water)
Then once dry do the same with fish oil
Works really well in doors and the firewall
With used cars I even get a dish washing brush and the hose into cavities like doors on a Landy. The kero gun really sprays the oil up into the firewall cavities at 100psi

The cleaning isn't so important with new cars and fish oil doesn't stink like it used too
Dc
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