Mix vinager, lemon juice and a little salt, use a sprayer, rust will be gone

The acid in the vinegar will eat the rust, what's the lemon juice and salt supposed to do?

Here's my deal... the scum on top is a combo of rust and grease. The solution isn't a degreaser but it does loosen the grease and old paint.



These rocker arm shafts spent over 10 years outside on an engine without valve covers...





The springs are old stockers that will replace the broken one's in my dropped '97 Ram... the bracket is off my dirt late model quick change. Again it was very rusty after 20 years of storage.

The key to this solution is patience.... don't expect haevy rust to disappear in a day. Light 'shelf' rust will dissolve in a few days... heavy stuff may take weeks. just dip it and forget it.

EvapoRust is amazing stuff. Will not touch the base metal, and rust is completely gone after a 24 hour soak. Not cheap, though. To do an engine block, you would need to buy at least 5 gallons, which would cost about $100.