I figured that post SHTF you would at least wipe off with a damp rag.

One of my (not to offend anyone) african-american friends had a hair brush, kind of soft like I would use when polishing my boots. He used it to brush his hair (which was VERY short) because he said he couldn't shower every day and that got all the gunk out of his hair and he just washed the brush every day.