This Process is very productive for addressing difficulties due to soap scum and grease. Nevertheless, warning must be exercised to prevent splashing, and it is probably not suited to PVC pipes, as extended exposure to boiling water could likely lead to harm. If fears persist, consulting with an experienced plumber https://www.google.com/maps/d/edit?mid=1RYeGumBz-KVqpQUfexdVq_m7DFLh-jc&usp=sharing