Shield Mr. Plumber 180ml Drain Unblocker, a product used for clearing clogged drains.

Water is required for product to work effectively. The red plastic cap must be submerged below water.  Do not remove standing water.  Add water if required.

Block overflow vents of opposite sink with a damp rag to prevent air escaping. Remove plug.

Place Mr. Plumber aerosol upside down on the drain opening and press firmly for 1 to 2 seconds. For slow moving debris, hold for a few seconds longer.

Run hot water to move loosened clog through the drain.

If necessary, repeat the application.