It is extremelly dangerous method of cleaning drain. But is very fast and good. As hydroxide dissolves hair, it can unclog showers and bathtube drains.
Also, as it dissolves human tissue, if missused, it can dissolve your face and eyes.
Not for stupid people. Do not use in americas as in america there too much lawyers and too much stupid people. :P


Sodium hydroxide is frequently used as an industrial cleaning agent where it is often called "caustic". It is added to water, heated, and then used to clean process equipment, storage tanks, etc. It can dissolve grease, oils, fats and protein based deposits. It is also used for cleaning waste discharge pipes under sinks and drains in domestic properties. Surfactants can be added to the sodium hydroxide solution in order to stabilize dissolved substances and thus prevent redeposition. A sodium hydroxide soak solution is used as a powerful degreaser on stainless steel and glass bakeware. It is also a common ingredient in oven cleaners.