I started out with Reptichip but found that I had fewer mold problems with Prococo. I go through about four blocks of Prococo a month, never really found that many foreign objects. I did find a small twig the other day about the size of a toothpick but I find that overall it's very clean. I also found objects with Reptichip too, but never something like a safety pin! Mostly it's just a twig or piece of twine here and there. Not sure about the dust issue, seems like both products are similar. I try not to let either one dry out to the point where it's dry and dusty.