Re: Walnut and comet cleanser in tumbler
I have a strong background in chemistry and this advice is well taken. Likewise, you should also avoid ammonia-based products like Brasso which will also weaken the cases. I've used a few squirts of Soft Scrub mixed into 5 lbs of media with good results. The label indicates none of the toxic ingredients mentioned above.
I also read an article recommending a few tablespoons of Bon Ami mixed into tumbling media with good results. Bon Ami is bio-degradable, contains no toxic ingredients, and is guaranteed not to scratch any surface. I'm going to give it a try.