This Process is very productive for addressing problems due to soap scum and grease. Nonetheless, warning really should be exercised to stay away from splashing, and it is probably not ideal for PVC pipes, as prolonged exposure to boiling water could potentially lead to destruction. If issues persist, consulting with https://www.google.com/maps/d/edit?mid=1_L4BY-SfoZBXl_IWtPpaaN1errmIQSk&usp=sharing