He needs to get some of the lubricant out of the ropes. Properly tensioned ropes are a must but he's slipping traction from too much lubricant. I've always heard never use chemicals on ropes, wire brushes and rags yes. I've seen guys use mineral spirits and rags but I disagree with doing that. I do like the use of carpet, IMO it keeps the cables clean which keeps dirt, dust, and debris from prematurely drying the ropes internal lubricant.