Good day people, let me pick your brains! I recently got a 901 and itworks well. Problem is the cartridges. After the wool got old I fliped the wool around as I always do, and there was this gunky white paste on the bottom side of wool. Naturaly I thought something wrong so I threw it away. Next it happened again and again. did I get a bad batch or is this normal for 901 wool? If normal I suppose I'll have to pick it off when flipping. what do you think?