The instruction says 4 ounce of desalter per Gallon of water. So before you do all of this, you have to go to manual carwash and use a stronger pressure wash underneath the car. We all know that regular water will not totally remove the road salt. After I desalt the car, I only used 6 Gallons total for the engine bay, and the whole undercarriage and under and behind door hinges area.
After a few days, when everything is , I will then steel brush those areas with surface rust then spray it with rust converter then followed by rust encapsulator. Both are in a spray cans and a lot easier to apply. You can get both from Eastwood.com (Don't buy POR15, it is expensive. )
I live in a condo with 2.5 car garage. So this is the ideal way for me to desalt the car and protect it for the next winter. If you have access to a garden hose, you can just buy some spray kit bottle that can be attached to the hose and that's where you put the desalting liquid and this is much faster process.
The EX35 does not have much rust under the hood even though I never desalt it after winter since 2008. The rust are more at the back where the rear differential is located. (Metals towards the rear area of the differential way up underneath and also the front and back lower arms.
Again, you need to pressure wash the car before desalting if you"ll use a portable sprayer for desalting.
