5 Drain Cleaning Steps Before You Call a Plumber
Last Updated: November 6, 2026
How to Unclog a Drain Safely, Step by Step
Stop if water backs up into another fixture, you smell sewage, or the drain has clogged repeatedly in a short span.
Never force a hand snake past hard resistance, or you can scratch a chrome trap or push the clog deeper.
If you dropped something down the drain, read our guide on retrieving items lost down the sink drain safely. Lingering smells usually mean biofilm; our tips for dealing with sink odors cover that.
Chemical Drain Cleaner Risks and What to Use Instead
Chemical drain cleaners can cause avoidable drain damage.
Skip "one flush" products marketed for full main line clogs, which need mechanical clearing, not chemistry. The EPA’s household hazardous waste guidance treats many drain cleaners as hazardous material.
When a Drain Cleaning Machine or a Main Sewer Line Clog Needs a Pro
A single slow fixture is usually a local clog. Multiple fixtures backing up at once, sewage odors, or water rising in a basement floor drain point to a main sewer line clog, and that is the point to stop DIY work.
A professional drain cleaning machine can cut through grease, roots, and scale, and a camera inspection can confirm the cause. If the camera shows a cracked, bellied, or root-invaded line, drain cleaning alone will not fix it; our article on sewer line repair signs and methods explains the options.
For a main line clog, professional sewer cleanout service in Denver clears the blockage and confirms the line is flowing. If the backup is happening now, after hours, or on a weekend, our emergency plumber page is the fastest way to reach us.
What Drain Cleaning Method Fits Which Clog
Different clogs need different tools. Here is how we sort them.
| Drain Type | Typical Clog | First Method to Try | When to Call a Pro |
|---|---|---|---|
| Kitchen sink | Grease, food scraps | Hot water plus plunger | Repeated clogs, standing water |
| Bathroom sink | Hair, soap scum | Remove stopper, hand snake | Clog returns within days |
| Shower or tub | Hair in the trap | Strainer removal, hand auger | Water backs up into tub base |
| Toilet | Paper, waste | Flange plunger | Bowl overflows on flush |
| Basement floor drain | Scale, roots, main line backup | None, call first | Any backup here is a main line sign |
| Main sewer line | Roots, grease, collapse | None, call first | Multiple fixtures backing up |
Fixture clogs respond to mechanical clearing; main line clogs do not. If unsure, run water in the sink closest to the floor drain and watch whether the drain reacts.
Preventing the Next Clog
Colorado’s freeze-and-thaw cycles matter too: a slow drain that worsens in winter can signal a partially blocked or bellied line where water sits. Our drain cleaning and clogged drain services overview explains when a camera inspection is worth scheduling.
When to Call After Hours Plumbing & Drainage Services
Call us when a clog survives a plunger and a hand snake, when more than one fixture backs up, or when you smell sewage.
Call 720-687-0052 or visit afterhoursplumbingco.com to schedule drain cleaning or request an estimate.
