Not sure if it's the same as ileostomy bags, but if it's drainable, empty it before showering. While in the shower, have a squeeze bottle with you and flush out the bag. Squeeze warm water into the sealed bag, swish it around, and push the water up. Repeat this a few times to clean the stoma. I do this at least once per day while sitting on the toilet. I add a little baby oil to the water - it smells great, cleans, and lubricates the bag, helping everything fall down. Hope this helps! Give it a try - your stoma will thank you and it saves changes in between.
Tracy