Hey all, my Dovo 5/8 has these strange black blobs on the backside of the blade, and it seems like the metal has a brown, rust-like hue to it. Is there a way to remove all this? Should i be concerned? Or am i just not maintaining the blade properly? Usually i just strop the blade about a dozen times after washing the hair/ soap off the blade, and put it back in the case. Thanks for any advice.