I took my new Maxpedition Kodiak Gearslinger with me camping this past weekend on our annual ATV'ing/ camping trip, and with all the clay dirt in the mountains of NC, the thing is caked with clay,mud, and dust. I got everything but the dust off with a damp rag, but in the seams and stuff i cant get it out. I called maxpedition and they told me just to clean it with a rag, but they wouldnt tell me anything else. Could someone please help me get it back black like it was when I bought it?