Karen is right. You don't need to get the water all the way up to the stoma area if you are concerned about
compromising the seal. You can just swish the water in the bottom part of the pouch to clean the last 2-3 inches and then dry inside and out with some TP.
I must say, I have never understood how warm or cool water would ever break the seal any more than hot & caustic output. Just sayin'