I dont know if it makes a difference, I had the sigmoid colon surgery.
My doctor, Dr. Pichot of Bangkok, had me cleaning the surgical site with cottonballs soaked in Betadine solution until the site was healed. It was to be done after I went to the bathroom as well.
I was to douche with a Red Ball Syringe with a diluted solution of Betadine and water. This was (if I gathered correctly) to be done daily. This I did with each morning shower.