360 Aluminium door sill plate, where I can find one?

My car has the optional factory leather / aluminium door sill. I can't explain the part but I'm N O T looking this part:

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But this inner (optional) part:

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There's some soot there after a major overhaul of some parts. This copper paste + oil + grease + whatever mixture stains have been on that part for a while, +2 months. I tried to remove it by applying a brake cleaner and got almost nothing removed.

So is there anything else I can do?

I cannot even figure out the proper word / name for that part in order to search from ebay or such.

 

There is a video on youtube of a guy who cleaned his up with scotch-brite. But you have to re clear it afterwards.

 

A soft scotchbrite wheel on a drill might be worth a try, try a soft one first as you can always try a medium if it does not remove it.
Is it stainless or aluminum ? If stainless try kitchen stainless cleaner, if aluminum be sure to avoid anything caustic as it will eat holes in it and lots of white fumes

 

Was told the "Magic Eraser" product will work on removing scratches from titanium watch bands....might be worth it to try on aluminum. No chemicals, no odors, no debris...

 

You may also try a very fine sanding sponge. Sold at Home Depot. I’ve used them on stainless and aluminum brushed finished pieces and the results are excellent. Just be sure to go in straight strokes along the piece.


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I would try sno-bowl toilet bowl cleaner, seriously. It's a mild acid and works great at cleaning stainless.

 

Bob BB has the best answer. But, I think a coarse Scotch Brite or foam rubber grit coated sanding block will work best. Fine will not match the original finish which is nothing more than SS or alum sanded with belt a sander. Nothing special about it.

 

You might want to try backing soda and water. Make it into a past and rub it in with a cloth going with the grain. I used that on my stainless steel refrigerator door and it removed all the rust and made it look like new.