Krown or Rust Check. Every year. It's the very best there is, and is
remarkably effective.

If you do not do this, you *will* end up with internal corrosion within
seven or eith years. You won't be able to see it until it's eaten through
the metal, or begins making red streaks on the paint, but you *will* get
rust. Don't let anyone tell you otherwise.

What the drippy stuff cannot do is protect against inept windshield
replacements, and stone chips. You have to patch those up yourself before
they rust.

As much as regular winter washing.

`Have it oil-sprayed it every two years; it should be enough.