I bought a used conical. The insides were a little “dirty”. Looked like a buildup of beer stone I thought. I soaked with PBW and it cleaned up good. At certain angles, I can see kind of a “rainbow” coloration in different areas. Thought it might still be some beer stone remnants or something. I just gave it a soak of BS Remover and going to let it sit to air dry. Is this normal after a fair bit of use? Anything to be concerned of?
Todd
Todd