I would avoid using Murphys on car finishes. I know there are some who swear by it but I base my opinion on several reasons:
1. The primary component of Murphys is Potassium Soap of Vegetable Oil. This accounts for approximately 20-30% of the content. The balance is Sodium EDTA, Propolyene Glycol, miscellanaous surfactants and fragrances and 50-80%water.
2. The pH is approximately 11.0 ± 0.6 which is VERY alkaline.
3. The MSDS specifically states to avoid reactive metals like aluminum, brass, bronze, etc. (this is important for the health of aluminum wheels and various other parts fabricated from brass or aluminum which could be contaminated by splashing)
4. It will remove ALL traces of wax or sealants.
5. If you use this on paint, even after rinsing there will be an oily film left behind that has to be removed by washing with a degreaser like Dawn or Ajax to remove the film prior to waxing or sealing.
6. The product was specifically designed for use on finished
WOOD.
I have always been a proponent of using things for their intended applications and this is no exception. Leave the Murphys to the floors and cabinets and get some car wash soap.
After washing with Murphys what would you wax your car with...Pledge?
