Way back when i first started reloading I would clean my sizing die a couple times a year with brake cleaner or engine starting fluid. But that was when the case lube was that gooey gel like stuff. Then I got smart and bought Hornady One Shot. Cleaned the sizing die thoroughly and occasionally give it a shot of the Hornady. In the past 15 years of so since this product came out I haven't cleaned my sizing die once.