Volvo Duoprop Cleaning, Sealine SC35

Owner reported loss of power/engine performance which is usually caused by fouled propellors. Typical issue of cavitation with counter rotating propellors. My camera angle blows as I bumped the camera early on the dive and didn't realize it. I didn't expect the amount of hard scale so took more effort and time than expected. I always feel good when I have a happy owner afterwards.