Eco-Wash etal.
Fan engines are more diicult to clean than non-fan turbojets.
The spinning fan acts as a centrifugal separator and throws most of the water and junk outward away from the core as intended by the design for rain and hail (that's another story)
The means of overcoming this in ground operation is to position the nozzles just outboard of the spinner to remove spinner bounce-off effects and to adjust the fan speed and water nozzels so that the water velocity has a chance to pass through the fan into the core compressors. all this falls under Newtonian physics, a law available for free to everybody (patent applications may disagree)