Step 6 – Flush with hot water
When the baking soda and vinegar begin to work, you will hear a fizzing sound. Leave for a few minutes, and wash the mixture down the drain using hot water.
Step 7 – Use the soda crystals
You can also use soda crystals to unblock the sink. Dissolve half a packet of soda crystals into boiling water, and pour the mixture down the drain to help eliminate soap scum and grime.
Step 8 – Clean the U-bend
If none of the previous methods have worked, remove the U-bend and clean it out thoroughly.
Step 9 – Grab the bucket
Identify the first bend in the pipe under the sink, and place a bucket or washing-up bowl underneath the U-bend to catch any water.
Step 10 – Drain the U-bend and inspect
Unscrew the fitting where the U-bend meets the bottom of the bathroom sink. As the water starts to drip out, cease unscrewing and allow the water to drain into the bucket or washing-up bowl. Once the water has drained, remove the U-bend completely and look inside it. Remove any debris from the U-bend and clean it out thoroughly. Re-connect the U-bend, and your sink should no longer be blocked. If none of the above steps have solved the problem, we recommend enlisting the services of a qualified plumber.