I run my car on the beach, though salt water and get it covered in sand. I just wash it out throughly including chassis rails and really flush the underbody and front end after each trip. Been doing it for over 10 years. No rust apart from a little around the back door seals which is not due to beach use. Vehicle in 15+ yrs old.
Vehicle protective coatings have come along way. Wasting your money in my opinion. Unless Toyotas are special and I doubt that.
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