@nealmccoy175 My heart goes out to your father. And yes, he should find a urology surgeon who can irrigate the bladder with ALUM or another chemical agent. People respond to different agents. There is ample information online. I used Amicar first which lasted only one month. ALUM is a harsher, stronger chemical. However, hyperbaric oxygen does treat this although 72 sessions did nothing for me. This might be a good option also.

ps: I got tired of running into the ER every time I had urinary retention so I learned how to self- irrigate using thin disposable catheters. (A Foley catheter is used by doctors. The clots can pass through, but they cannot through a thin catheter.) This is how it’s done:
With a plunger filled with sterile water and 5% hydrogen peroxide (breaks up clots) inserted into the end of the catheter the solution is plunged into the bladder. The water pressure pushes the clots away from the bladder opening and the peroxide softens and breakes down the clots. The catheter is immediately pulled out because the cots cannot pass through. (This didn’t dawn on me the first time and the catheter and all the blood and urine exploded across the bathroom and hit the sink cabinets). The gloved hands and equipment must be kept sterilized with alcohol. Sometimes it took several tries. I attached a photo depicting a successful irrigation. It’s a bit macabre; not for the faint of heart.

@nealmccoy175 Hi I did 80 sessions of hyperbaric a year ago because I went through the same thing from radiation 7 years ago. So far after a year I have had no issues.