You can often clear a simple clog by pouring common household mixtures down the drain, but you should avoid harsh or dangerous combinations and know when to stop and call a plumber.

What to Pour Down a Drain to Unclog It

1. Best safe things to pour down the drain

These work best for slow or mild clogs (hair, soap scum, grease film), not for solid objects or tree roots.

  1. Baking soda + vinegar (classic fizz method)
 * Pour about 1 cup of baking soda into the drain.
 * Slowly add about 1 cup of white vinegar.
 * Let it fizz for 15ā€“60 minutes (cover the drain if you can).
 * Flush with very hot or boiling water.
 * Works well for: bathroom sinks, tub drains, lightly clogged kitchen sinks with organic gunk.
  1. Baking soda + hot water only
 * Pour 1 cup baking soda down the drain.
 * Follow with a kettle or pot of very hot or boiling water after 10ā€“15 minutes.
 * Gentler than the vinegar combo; good for routine cleaning and mild odors.
  1. Baking soda + salt + hot water
 * Mix 1/2 cup baking soda with 1/2 cup table salt.
 * Pour the dry mix into the drain.
 * Wait about 15ā€“30 minutes.
 * Flush with boiling water.
 * The abrasive salt plus heat can help break down tougher soap and grease films.
  1. Dish soap + hot water (especially for greasy kitchen clogs)
 * Squirt a generous amount of degreasing dish soap into the drain.
 * Follow with a large amount of very hot water.
 * The soap helps emulsify grease so it can be washed away.
  1. Enzyme or ā€œnaturalā€ drain cleaners (storeā€‘bought)
 * These contain enzymes or bacteria that digest organic matter (hair, food, soap).
 * You pour them in and let them sit for several hours or overnight.
 * Theyā€™re slower but gentler on pipes and septic systems than strong chemical drain openers.
  1. Commercial chemical drain openers (used with caution)
 * Products based on sodium hydroxide or similar ingredients can dissolve hair and heavy buildup.
 * Follow the label exactly: correct amount, contact time, and flushing instructions.
 * Never mix these with other cleaners or with baking soda/vinegar methods.

Think of baking soda + vinegar + hot water as your ā€œfirstā€‘lineā€ option for minor clogs, and commercial products as a last resort before calling a pro.

2. What NOT to pour down your drain

Some things can damage pipes, create toxic fumes, or make the clog worse.

  • Bleach mixed with anything acidic (vinegar, toilet cleaner, etc.) ā€“ can create dangerous chlorine gas.
  • Mixing different commercial drain cleaners together or using them right after a home remedy ā€“ can cause violent reactions and heat.
  • Strong acids (like muriatic acid) ā€“ often overkill for home use, risky for you and your plumbing.
  • Large amounts of cooking oil, grease, or fat ā€“ these cause clogs; donā€™t ā€œpour moreā€ to fix an existing one.

If you already used a chemical cleaner, do not immediately follow it with vinegar, baking soda, or another product; flush thoroughly with water first and wait, or call a plumber.

3. Quick miniā€‘guide by situation

Slow bathroom sink or tub

  • Start with:
    • Baking soda + vinegar, wait 30ā€“60 minutes, then hot water.
  • If still slow:
    • Repeat once, then try a plunger or small drain snake.

Greasy kitchen sink

  • First: dish soap + very hot water to push out grease.
  • Then: baking soda + vinegar, followed by boiling water.

Toilet (special case)

  • Donā€™t pour strong chemical drain openers meant for sinks into toilets; they can damage the bowl and arenā€™t always effective.
  • Safer options to pour:
    • Hot (not boiling) water plus dish soap to help loosen organic waste.
  • Often, a plunger or toilet auger works far better than anything you can pour in.

4. Table: Common ā€œwhat to pour down drainā€ options

[9][10][5][7][3] [10][3][8] [9] [4][8] [8] [3]
What you pour Good for Basic steps Notes
Baking soda + vinegar Slow sinks, tubs, mild clogs 1 cup baking soda, 1 cup vinegar, wait 15ā€“60 min, flush with hot/boiling water Very popular, ecoā€‘friendlier first step
Baking soda + hot water Odors, light buildup Pour baking soda, wait, then flush with boiling water Gentle maintenance method
Baking soda + salt + boiling water Tougher soap/grease films Mix 1/2 cup each, pour, wait 15ā€“30 min, flush boiling water Slightly more aggressive but still homeā€‘friendly
Dish soap + hot water Greasy kitchen clogs Pour soap, follow with a lot of very hot water Helps emulsify grease
Enzyme drain cleaner Hair, organic buildup Pour per label, wait hours/overnight, flush Slow but gentle on pipes and septic
Chemical drain opener Stubborn, organic clogs in sinks/tubs Use exact label directions, then rinse thoroughly Last resort at home; never mix with other methods

5. When pouring things down is not enough

If any of these are true, stop with DIY pourā€‘in methods and get a plumber or use mechanical tools instead.

  • Water backs up in multiple fixtures (kitchen + tub + toilet).
  • You hear gurgling in other drains when one is used.
  • Strong sewage smell from drains.
  • Repeated clogs in the same spot even after using baking soda/vinegar or a cleaner.

These signs usually mean the blockage is deeper in the line or in the main sewer, where pouring more stuff down the drain wonā€™t help and might make things worse.

Information gathered from public forums or data available on the internet and portrayed here.