This might not be the appropriate place on the forum but.... My stainless steel shot for my tumbler has started to go rusty. I cleaned it as best I could but everything I put in the tumbler since is coming out dull and not shiny like it used to. Does anyone know how I can get it clean again. Also, I always used to use dishwashing detergent and water only which worked like a charm. However, I bought a new tumbler and the instructions say DO NOT USE DISHWASHING DETERGENT as it wrecks the inside of the tumbler - only use pure soap. I am now using Lux pure soapflakes but I don't think it works as well. Any help would be most appreciated.

 This is why a lot of us prefer stainless steel shot!

We've used shot that rusts but kept it in the barrel with soap and water covering the shot and it doesn't seem to rust. Cleaning is usually nothing more than running it with soap, change the water , add more soap and run it again . Repeat until clean.

I don't know about soap being bad for the barrel.  My favorite is a powder soap mix sold at rock shops and Rio Grande. Seems to work better than Dawn. Maybe it has a rust inhibitor?

Thanks for that. I'll try Rio Grande. This is a new batch of ss shot too - never had a problem with the first lot - really annoying when your jewellery comes out duller than it went in :(

 I think the Rio product we used is called "Silver Lustre."