I am working on various parts with a similar condition, the one pictured is an exhaust heat shield which is I believe Stainless(it is non magnetic and the condition as pictured is after 17 years of being driven).
Methods I attempted so far to remove the contamination:
- steel wool and metal polish, followed up with wool drill polisher (highlighted in red)
- steel wool, metal polish, and a scuff pad, followed up with wool drill polisher (highlighted in purple)
- metal polish, and goo gone with a wool drill polisher attachment (Highlighted in yellow)
I am not exactly sure what the contamination is, possibly road grime, or just really caked on dirt. How would I go about removing the grime off of this part?
The most successful of the 3 methods I tried was the scuff pad, but that left the surface scratched. So to get a non-scratched surface I'd have to work up through the grit levels and finish with a polish. I'd like to avoid this as it is very time consuming.