1. Yes, it is an acid, and yes it can eat away at the bores. How to handle this.
- First, Use only on Stainless steel. there are problems using it with blued steel.
- Second, don't leave the stuff in there for hours and hours. The reaction takes only a very few minutes to do the majority of the work, then dump it out.
2. Residue: Lead acecate is not the end all evil that it's been made out to be. It's used in all kinds of dyes and is still used in certain paints.
It's problematic, but there are some cases where it's the only thing that gets the job done.
- It is toxic to eat, just like the lead paint in old homes that you're not supposed to eat either. Don't drink it, don't pour it down the drain.
- the danger comes from it being in solution. your skin will absorb it in this form. that IS bad for you. Wear gloves. Keep it off your skin.
3. Disposal. Lead acetate can be disposed of properly through the normal household hazardous waste channels.
3a. caveat - you don't need 5 gallons of the stuff to clean a bore. you need about 1/4 cup. dump the used solution in a 1/2 cup of CLR or battery acid to render it mostly inert (if you live in a rural area with limited facilities).
If you really want to take care of it well, boil off the water and vinegar - the lead acetate will come out of solution. then mix it in with some leftover latex paint and let that dry. this will encapsulate it and prevent it from going back into solution.