To remove a washbasin blockage, you can follow these general steps:

1. Turn off the water supply to the washbasin to prevent any further water flow.
2. Clear any debris or hair from the sink drain using a pair of gloves or tweezers.
3. If the blockage is still present, try using a plunger to remove the clog. Fill the sink with enough water to cover the rubber part of the plunger. Position the plunger over the drain and push down and pull up repeatedly until the clog is dislodged.
4. If the plunger does not work, try using a plumbing snake or auger to remove the clog. Insert the snake or auger into the drain and turn it clockwise until you reach the blockage. Use a back-and-forth motion to break up the clog and remove it.
5. If the blockage is still present, you may need to remove the sink trap. Place a bucket under the sink to catch any water or debris. Use a wrench or pliers to loosen the nuts holding the trap in place. Remove the trap and clean it thoroughly. Reinstall the trap and tighten the nuts securely.
6. Turn on the water supply to the washbasin and test the sink to ensure it is draining properly.

It is important to wear gloves and take appropriate safety precautions when attempting to remove a washbasin blockage. If you are unable to remove the blockage or are unsure about any aspect of the process, it may be best to hire a professional from Locals4u for assistance.