During the winter months when I am in Kentucky, these roads get salted a lot. I have a pressure washer, and a attachment that is used to clean concrete floors. Its on wheels, blast the water straight down. But if you flip it over , it blows water up very well, just like at a car wash.
Question.....my pressure washer has a line that can induct soap. Is there any product that could be inducted while washing the bottom side that would help prevent corrosion ?
Charlie

I’ve never used them for cars, but they make salt off and salt away (two product names) for boats. It may be worth a look.

Get some PB Blaster Surface shield or Fluid Film (PB Blaster Smells better) and coat your undercarriage annually in the fall. It's about 10 bucks a can and you can do a halfway decent job of coverage with two cans.

Spray the underside of your vehicle with a mixture of used engine oil and diesel fuel.

How long do these methods actually last when driving in road salt spray?

I've heard products with lanolin work well but fortunately I'm no longer in a salt state.

I’m not familiar with anything you can add to a pressure washer, but I would clean it best I could, let it dry, and then hire a teenage boy to apply fluid film or like product.

This.

I use the surface shield and it took 6 cans to complete the job, first time around. This on an older truck with lots of metal. Apparently it is good for 2 years.

I alse use the surface shield on boat trailers which frequently get dunked in salt water, as well.

I use fluid film on my Tacoma. Usually after hunting season I pressure wash the frame and underneath. Let it dry then 3-4 cans of fluid film. Western VA doesn't get snow much but they still use the salt and brine on roads. Tacoma frame is still fine . Mine is an 09 so the frames were suspect to begin with.

Cosmoline Direct, "RP-342 Heavy", comes in black also, great product, doesn't easily wash off.

Promotion going on now.

Fluid Film or Wool Wax

In high wear areas (road spray, etc.) it's going to obviously dissipate quicker than other areas. But I pressure wash my vehicles typically a couple times a month in the winter and I feel that most of the sprayed on film will make it through the winter.

Get the little wand adapter, only works on fluid film/wool wax can, but there's an adapter for PB Blaster. Helps to get up in the cavities of the frame, etc.

The Car Wash I use sprays very hard underneath as I drive in. I can feel it blasting under the floorboards. I gotta believe it's getting the salt off. Our Highway dept's really love to LAY DOWN THE SALT !!

It is actually too late to prevent salt corrosion. The only real preventative measure would have been to give a brine enema to the guy who decided spraying salt all over was a good idea. That ship has sailed. GD

Morton Salt Co. is based in Chicago. They give free salt to the city. The former mayor could have used that brine e..mx...........
No self-respecting Canadas fly there..........