Cleaning wires

If soaking your harness in solvents/fluid has worked then that's great. I personally wouldn't do it. I think you'd be better off just soaking the connectors and such that are not covered by the plastic coating. The way I see it is by submerging the wires in fluid you create a capillary action on the wire sleeve. The capillary action increases with the smaller diameter "hole" and that diameter would be all the air void space between each strand of wire within the radius of the protective sleeve. Also, unless you have a tank where you can stretch each wire out flat along the bottom, there will be areas within the plastic wire coating where the fluid will not reach due to the head differences in the water. At best it seems the head difference and capillary action would be limited to maybe the first few feet of wire from each opening leaving the remaining wire untreated. I don't know how much pressure it would take to ensure the fluid would go through the entire wire or if would matter with a bundle of wires curved up in a 5 gallon bucket, but I wouldn't want fluid in my wires. It might weaken the plastic sheath too. Maybe on some wires the current would provide enough heat to dry them?. Possibly. How could you be sure there is zero condensation/fluid in the wire before it's put back into service? The prospect of driving around with water in your wires doesn't seem like a good idea to me and it may be much less trouble to just replace it for good insurance. IMO. But, if it works for you that's what matters.