Now that I think of it, there was one vehicle where I tried the Ranger method and I couldn't clean up the fluid after several attempts. It was my neighbor's 5 speed 2003 Frontier with 38K miles. He sold it last year. The kicker was that he went through a clutch every 15K miles! He was on his 3rd at this point and I don't know how many times the fluid was changed, if ever. So at best with 38K miles, there was a half of clutch disk worth of clutch dust in that fluid...it was nearly black when I got to it. He loved to ride that clutch pedal.