Lufthansa Technik (LHT) has developed a new engine wash procedure that will allow waterless washing of aircraft engines in any type of weather. Cyclean Dry Ice, which uses a mobile blasting system to shoot tiny dry ice pellets into an aircraft engine to dislodge dirt, can wash engines even in below-freezing weather.
According to LHT, Cyclean Dry Ice reduces the engine cleaning process to 30 minutes compared to conventional engine washes, which will result in quicker turnaround times at the gate. Research and development on Cyclean Dry Ice began in 2014.
Collected and summarized from the source below by Minh Pham https://www.mro-network.com/engines-engine-systems/lufthansa-technik-develops-waterless-engine-wash-product