I've tried this method several times, it always works.

Step 1: Gather Tools

All you need is an old toothbrush and some hydrogen peroxide.

Step 2: Pour It In

Make sure the drain is closed and pour enough hydrogen peroxide to cover the drain.

Step 3: Let It Soak

You will see it start to foam up, let it sit there for about 3 minutes.

Step 4: Scrub

After about 3 minutes, take your toothbrush and scrub around the drain.

Step 5: Drain

Drain it and run the water.

Step 6: Ta-da!

You're done!
Peroxide is non toxic & doesn't smell like vinegar. I use this technique. It is quick!
<p>I use citric acid as it is non-toxic, much safer and does not smell like vinegar. It is quite useful for removing deposit from kettle as well.<br></p>
<p>Here's a different method that works for me. Wet toothbrush + baking soda. Scrub. </p>

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