So I work in salt all winter here is what we do.
Take a clean bucket and put barking soda in it. We used a hole box one of the small ones. Then we add a quart of purple power. And a quart of car wash soap. Mix it up then put in a pump sprayer then spray it all over. Then hit it with the power washer. This works good for us, we have been using it for two years now. It even works good for your truck and car. And a hole bucket will last a while. But the key ingredient is the baking soda you need to neutralize the salt.