You do need to wash your winch rope IF you have done some pretty hectic recoveries. Mainly if your rope is allowed to drag through the mud when pulling it out off the spool. When it's slack on the ground, potentially getting walked on, is when the mud and small dirt gets in. Then when it tightens during recovery those little grains of dirt and small stones start to cut through your rope. It's not gonna happen all of a sudden, but over time of many recoveries damage will occur.
If your in a D40 and just getting pulled over a gutter in the street then it's probably not going to get dirty. Hahaha
I disagree and will with anyone who says its a "MUST DO" for the simple reason that there is so many fibres that make up the rope cutting one or two at a time here and there over the length of the rope doesnt effect it as all the other fibres pull tight around it and work off each other. It would be different if you cut a heap at once so you cut through 25% of the fibre in one location.
Its the same with ski ropes (i know there not pulling 3t but they pull what there designed to) you can splice a ski rope together and if it is done correctly you dnt need a knot or swages you can simply weave it through it self, and when its got weight on it, it pulls ITSELF tight and doesnt allow the other fibres to slip through it.
As ive said before i have had the same rope on my winch now for TWO navs and 3years and have done countless recoveries in all sorts of terrain and ground types and it is still going fine, no breakages at all yet, even after using it the weekend to recover my mates old 60 series up a muddy and rocky gully where he was so jammed against a sand stone step he snapped a cv and my DIRTY rope held strong.
Can i ask if you have had a rope snap then looked at it and said "wow look at all the dirt in here thats what must of coursed it to snap and it clearly wasnt the fact of the weight i was winching or that i have dragged it over those rocks"
If a rope has snapped who has been able to determine that is was through LACK of WASHING that coursed the FAILURE??
Would you be able to tell?? if the rope broke simply from being overloaded or has ben dragged over sharp rocks coursing allot of EXTERNAL fibres to break which CANNOT be strengthened by the other fibres around them like they can when they are the internal fibres.
The bottom line is Yes the rope will eventually wear out, sooner or later it will fail weather from over loading or miss use or from just being used so many times.
So spend the $170 and carry a spare, they dont weigh much or take up much room and it is by far the cheapest insurance.
Also as ive said before if it does snap and you are not in a position to replace it, JUST TIE A KNOT IN IT, and replace it when you are in the position to.
IMO its washing the ropes out like a mad person after every use is not that big of an issue, yeah give it a bit of a hose or something if you must but washing it like you do with your undies is just not going to make that much of a difference.