Removing paint

[Regicollis]

I bought a third party metal lens hood on eBay. When it arrived it had the worst paint job ever. The paint was sticky and smelly and really disgusting. I want to remove the old paint and re-paint it. By working my way through every chemical in the house I found that ammonia was effective at dissolving the paint and I managed to remove most of the paint.

But I still have a few black "shadows" left on the metal. The ammonia does not seem to do anything to dissolve the paint. Do I have any other options than using sand paper to remove the last paint?

[eddieitman]

Caustic soda should do it or paint stripper like nitromorse

[sichko]

[peterqd]

Can you use a buffing wheel to rub it off? Or how about a hot air paint stripper?

[Big Dawg]