Do not be fooled, find a piece you do not mind splicing and strip it back. You might be surprised. California and Arizona cars and areas with low humidity might be fine but for most of the rest of us it is suspect.
I just cleaned mine with that cleaner (purple power)and after that it goes into a vacuum chamber to remove all the air with an A/C pump for 2 hours of vacuum. open and add Alcohol then Vacuum again then into pressure pot to insert Alcohol into wires to make sure they are clean. Air dry and done. I have never had any corrosion on any harness I have done that way in over 50 years of doing it that way. I still have the original harness in my 70 challenger that was done in 1990 and it looks as good on the ends and even at the darned fusible link area (that I blew out by not dodge having a tire piece on a passing semi get lodged under the car and short the battery cable to the headers) . I also have a 1950 firetruck that was cleaned the same way in 1966 and our family still uses it every fire season without any wiring problems. there is about 300+ connectors in that truck including the 6 pumps and valving. Yes I have cut it back in some areas to check and make upgrades in the Sterio and power option areas on the challenger to make sure I didn't introduce a corrosion substance. Now if the wires are brittle then I rebuild the harness. since I can pour my own connectors from plastic I can now choose what I want to keep and what I need to rebuild. 30 years ago I didn't have that option. so it was cleaner,alcohol, vacuum. dry pressure pot dry and done. I have even made me a special Wire Trace jig so I can paint the traces on the wires I buy to make it look correct now.
