Toxic Corrosion is Soviet Line 2 Top Secret Protocol in Command & Conquer: Red Alert 3. By selecting a friendly unit, that unit can be contaminated with Toxins, causing it to be consistently damaged, and spread a toxic mess on the ground or sea. If the contaminated unit is destroyed, it will spread a cloud of toxins, contaminating a sizable radius. The effect can be removed by repair drones or the Repair Multigunner IFV. After effect removal, the contaminated vehicle will still retain the green shade. A submarine can be affected by Toxic Corrosion only when it is surfaced, but it will keep the effect after it submerges. This potentially allows the toxin to spread at sea better due to the submarine's immunity to most conventional weapons.
Strangely, toxin created by this protocol does not clear garrisoned structures.