Yes, soap can block drains. Over time, the fatty acids in soap can build up on the walls of pipes, causing a clog. In addition, soap can also react with minerals in hard water to form a sticky substance called soap scum.
This scum can adhere to the sides of pipes, eventually leading to a blockage. To avoid this problem, it is important to use a drain cleaner on a regular basis. Drain cleaners contain chemicals that break down soap scum and other debris that can cause clogs.
By using a drain cleaner on a monthly basis, you can help keep your drains flowing freely.