Answer: -try vinegar and baking soda...half cup of each put baking soda in first..then pour in vinegar....and watch the foam clean the pipes..And Not hurt anything, including the environment -I would try a corkscrew spring rotary cleaning tool. They are about the size of both fists and have a crank handle on 10 or 20' of 5/16" spring. $10 maybe. -Shower drains are usually clogged with hair and grease and soap. Lye based cleaners such as crystal Drano work very well. The alkalai turns grease into soap, so that it can flush down the drain.