Allow the solution to sit in the pipes. The waiting time depends on the severity of the blockage:

Are you tired of dealing with clogged drains and the hassle of calling a plumber? Look no further! This comprehensive guide will walk you through the process of using caustic soda to unblock drains, safely and effectively.

Disclaimer: This guide is for informational purposes. Handling chemicals carries inherent risks. Always follow the manufacturer's instructions printed on the caustic soda packaging.