The vinegar in the hot sauce does the cleaning. Putting a dirty penny in a bowl of pureed tomatoes and letting it sit will do the same thing. Imagine what tomatoes do to your insides...... Anything mildly acidic will do it.Not sure if I'd be scared of lead.
I used to work at Taco Bell when I was in HS.........many moons ago. You could put a dirty penny in the little container of sauce and in day or so, that penny would be clean and shiny. Cant imagine what it did to our stomachs all those years.
If your stomach was made of metal you would have something to be worried about.