There is a lot of good information about cathether care on Youtube from reputable medical institutions. One is from John Hopkins Urology called Cathether Care for Men. It has excellent tips on cleaning the tube ends, cleaning and lubricating the tip of the penis etc. There is aother good video I have viewed a couple of time by Cone Health. It is entitled "Robotc Prostatectomy Video Series #4 : Cathether care. Some of the nurse's advice has to be adapted to a situation where the patient is doing the cleaning instead of someone helping the patient.