Folks.. I have a pvc garage floor drain that runs to the outer wall and discharges to the ground. This is Michigan and the water has frozen at the 90 elbow as it exits the outer wall.. the pvc is obviously cracked because water now runs down the outer wall into the basement. DO you think I could pour asphalt driveway sealer down the drain to seal the crack? Other ideas? I don't want to have to rip up the concrete.