Today I cleaned my exhaust manifolds of a moderate amount of rust by soaking six hours in a solution of citric acid and washing soda and then rinsing with deionized water, finally drying and coating with WD40. Quite happy with how they cleaned up, both inside and out. Is there anything I should do to the pitting that remains on the individual runners from the heads or should I just leave well enough alone? Any suggestions would be appreciated.
These are orgininal to the car and are dated 2 months earlier to the assembly date, so I'd like to keep them rather than going for a reproduction.