PeteE - Thanks for your comments concerning Wipeout. Perhaps a chemical reaction between a product component and the steel. I've just recently purchased Wipeout and will pay attention for side effects when using it on the SS rifles. Presuming HOWA notified of this incident, I'd be curious about their response. Putting myself in HOWA's shoes...I would want to know about it i.e. steel not to spec. etc. You may re-call SAKO having SS issues years ago. Regards, Homesteader.