I’ve had a bottle of RCBS Case Lube 2 for a number of years now. It went bad on me with small spots of a light brown mold visible inside the clear nozzle and the lube has a slight brown color. I had a bottle RCBS CL2 I bought last year as a back up which the lube is clear with no color. I removed the lube pad and washed it in warm water with Dawn dish soap. I guess because the lube is biodegradable and water soluble, it can get mold growing in the bottle. Although the lube pad didn’t have any mold growing on it. The thing is my loading room is in the house basement with a dehumidifier running. No mold anywhere in the basement, and raw steel can sit for months without rusting. I will continue to use RBCS CL2.