A remotely-operated tank cleaning device for precise, high-pressure spray for use in limited access areas. The device offers features unavailable in tank cleaning technologies currently on the market, providing for better, faster and cost-effective tank cleaning. The directed spray mast was originally conceived to eliminate the inherent dangers involved with sending workers into storage or process tanks during cleaning operations. The directed spray mast was designed to provide more precise cleaning of problem build-up areas within a tank versus the more global cleaning approach of existing technologies.