Bronze Cleaner (Non-Toxic)
Bronze Cleaner: Baking Soda + Lemon Juice = Happy Sailor
Enviromentally Safe and Non-Toxic!
Use an old sock or wore out shirt to apply a peanut butter consistency mix. (HINT: Start with Baking Soda FIRST!)
For projects that I dont OCD need right now I also use a plastic tub (or bucket) to mix it EXTRA lemon juice so that its "Soupy" and let the item(s) soak for days if need be. I shake the tub or bucket a few times a day. you will start to quickly notice the mixture turning green as it cleans the bronze items.
Again - you can speed this up with some elbow greasse or cheat like I do with dremel polishing attachments for stuff I need sooner. Enjoy