How to clean out a main sewer line clog Step 1: Loosen the cap on the drain pipe. Step 2: Open the cap and let the buildup drain out. Step 3: Feed the auger cable into the drain pipe. Step 4: Run the auger until the clog is clear—and beyond. Step 5: Hose down the pipe and auger cable. Click to see full answer. Also asked, how do you dissolve toilet paper in a sewer line?Use a closet auger to help dissolve the toilet paper in the drain. Augers are simply long pieces of wire or thinly shaped metal that are inserted into the toilet drain. They have small hooks or barbs on the end that can break up clogs and help separate the paper so that the water can dissolve the toilet paper.Secondly, will Drano unclog sewer line? Bust a Sewer Clog With Enzyme-Based Drain Cleaner It’s hardly ever a good idea to put Drano or a similar product in the toilet because it contains sodium hydroxide, which generates heat and can damage the pipes. An enzyme-based main line cleaner is safer, but it takes longer to work. Considering this, how do I clear my main line block? How to Clear A Main Sewer Line Clog Loosen the Drain Pipe Cap. The first step is to find your main drain cleanout location. Remove Cap, Allow Build-Up to Drain. Once you remove the cap, step away quickly. Insert Plumbing Snake into Pipe. Allow Plumbing Snake to Run Until Clog Is Gone. Clean Up. What are signs of sewage backup? Check out these five sure-fire signs you’ve got a sewer backup that needs attention right away. #1 More than one drain is clogged. One drain getting clogged happens. #2 Water backs up in other drains. #3 Bubbles, bubbles and more bubbles. #4 Toilets aren’t flushing like they shoulder.