IDK ROTATING NOZZLES by DIRT KILLERThe Industrial Dirt Killer (IDK) spins slower than the Dirt Killer nozzle thus creating a larger water droplet with a greater impact. Good for cleaning concrete steel, barnacle removal, etc. Many truck wash facilities prefer rotating nozzles to assist in removing the dirt. Industrial Dirt Killer nozzles can be rebuilt easily. The rebuild kit includes all internal parts, so once the nozzle is rebuilt it is like new. Rebuild Kits Available 3. 5 4. 0 4.