It seems like no matter how careful I am in lubing bullets, whether with my Lyman sizer or pan lubing, I end up with lube on the base. I took a 6" piece of scrap 2 X 4 and stretched an old sock over it. I just rub the bullet base on the sock to clean it. When all 4 sides are pretty well used, you can either wash the sock or simply replace it with it's mate.