The interior use Scotchbrite pads. No need to kill yourself beyond being mechanically clean and well oiled.
The exterior the best way is by sandblasting/beadblasting.
Next best would be removing paint and sanding (mechanical rust removal)
Electrolytic means can be mentioned - as can immersion in a bucket of molasses.
I mostly use "Prep & Etch" (available at the Orange Place) as a final rust conversion from red rust (which resists/lifts paint) to black rust (which can be painted over and paint slows the conversion back to red rust.) Probably good to do with any of these as it leaves a phosphate coating which is ideal for painting.
Joe K
Simple Green works well along with a product called
"L-Bow Grease"!
Pluck
Simple Green works well along with a product called
"L-Bow Grease"!
Pluck
Does anyone know of inductrial strength brillo pads or somethning like that for cleaning out the oil pan walls? Also want to clean and prepair the exterior for painting.