:'( Trying to fix clogged drains. While unscrewing pipe fitting from wall, pipe cracked. Lots of buildup in the grooves. Trying to replace the fitting and it won't fit due to grooves not being clean. What 's the best way to clean the grooves. Been "chipping" at it for 2 days... we are out both sinks in the bathrooms until this gets fixed. Also, would you recommend I get a plumber, or should this be an easy fix? Thanks so much for your help :)