Use Mr Plumber when symptoms of clogged drains like choking in the drainpipe is observed. Remove excess water accumulated at the neck., Put the whole quantity of the Mr Plumber pack in to the pipe and pour a glassful of water into it., Leave it for 30 minutes for an effective reaction. (For better results, leave it overnight)., Flush well with water to the clean the drainpipe of all blockages.