This is dipping the baffles in a 50:50 mix of white vinegar and hydrogen peroxide. Later on, the lead acetate will be precipitated out into lead chloride by adding table salt and disposed of at the hazmat facility at my county dump. In the video and some of the pictures, you can see bubbles of lead floating to the top, popping, and the lead particles plummeting back down to the bottom. Two pairs of nitrile gloves were worn and of course, this activity was performed outside as so to avoid the fumes.
Cleanup was easy. At 2.5 hours in, I pulled the baffles and wiped them off on shop rags. Reinserted for another 2 hours. Wiped off again, the results below. Literally like factory new.