I've scrubbed for two hours and I still can't get the milky white road salt grime from the bumpers and running boards.

Suggestions?

 

I've used Mequiars #39 Heavy Duty Vinyl Cleaner, which seems to work well.
Followed by 303 protectant wiped fully dry or it tends to streak.

 

Get a can of Mequiars Tire Shine. Spray a light coat on the black fenders and wipe down with a clean dry towel. They'll look like new when your done. Works great on the black bumpers and stock rock gaurds too.

 

Turtle Wax Ice liquid....effortless amazing results....wipe er' down from head to toe!

 

Heavy duty power washer always works for me.

 

Turtle Wax Ice LIQUID

 

Every spring I take the wifes JK Unlimited to the local HydraSpray, blast the entire vehicle including the underside, then back home in the drivway for a handwash using Mequire's wash, scrubbing all the trim with a cotton cloth. Then once dried and claybar'd, a good coat of Meguire's NXT on the body. For the trim I start with a good coat of Mothers Back To Black making sure to rub it in good. Next a couple coats of 303. The I go over the entire Jeep with Turtle Wax ICE. (liquid)
From then on it's just a wash and wax with ICE, both body and trim throughout the summer. Although the ICE doesn't last that long, with a good cleaning and base wax to start, the ICE does an excellent job for both body and trim, about every 3-4 weeks. Her fenders aand bumpers look as good today as they did when she drove it off the lot back in Oct 06.

 

I've been using 409 on the fenders ever since I got my 07. Works great to remove the dirt. I use nu-finish on the body.