I shoot mostly .38's in my .357's. I don't clean after every outing, probably after about 200 rounds and I don't have any problems with them. 586, 686.
I do have a pet model 19 and a Python that I load everything in .357 cases. Long time ago I convinced myself that even light loads were more accurate in .357 cased. This proved to be wrong, the 586 and 686 are both very accurate with .38 cases. Clean them once a month and don't worry about it.