Loosen the cap slowly. If water starts to spill out immediately, there is significant pressure, and you should call a professional to avoid a sewage spill. 2. The Baking Soda and Vinegar Flush
This is the least invasive method and is safe for all pipe types. It works best on soft blockages like grease or organic buildup, but it is generally too weak for solid obstructions like tree roots. how to unclog sewer pipe