How To Unblock Outside Drain Pipes May 2026

Pour 1 cup of baking soda + 1 cup of vinegar down the outside drain, followed by hot water every 3 months. This breaks down soap scum and grease naturally. 6. Summary – Best Approach by Blockage Type | Blockage type | Best method | Avoid | |---------------|-------------|-------| | Leaves & mud | Drain rods + hose flush | Chemicals | | Grease/fat | Hot water + jet washer | Plunger only | | Roots | Professional (mechanical cutter) | Chemicals | | Solid object (toy, rag) | Wet vac or drain rods with hook | Jetting | | Ice (winter) | Hot water + salt | Rodding (can crack pipe) | Final Verdict For most homeowners: Start with removing the cover and clearing the trap by hand. If that fails, use drain rods – they are cheap, reusable, and effective for 80% of outside blockages. Avoid chemicals unless you are sure the pipe is not completely blocked (they just sit on top of standing water). Call a professional if you cannot clear it within 1 hour or if water backs up inside your house. ⚠️ Never ignore an outside drain blockage – it will worsen and can lead to internal flooding or foundation damage.