What is Under Spray with Rust Inhibitor?

Under Spray with Rust Inhibitor refers specifically to the treatment aimed at protecting the undercarriage of a vehicle from rust and corrosion. The concept involves using a liquid solution that is sprayed onto the underside of a vehicle to create a protective barrier. This spray often includes a rust inhibitor that helps prevent the formation of rust due to moisture and road salts that can accumulate on the underbody.

In this context, the correct answer highlights the action of using a spray to effectively flush out contaminants and apply a protective layer at the same time. It's this combination that ensures the vehicle's underbody remains protected from the corrosive effects of environmental factors.

The other options do not accurately reflect the nature of Under Spray with Rust Inhibitor; they may describe different processes or products but miss the specific combination of protection and flushing that is crucial to this treatment.