Drain unblocker liquid for any blockage Do you need a liquid drain cleaner? With HG drain and plug unblocker you remove a blockage in virtually no time. This drain liquid is ready for use, does not foam or splash when it is poured down the drain pipe. Furthermore, the blockage can never be made worse by HG drain and plug unblocker as could happen with accumulated powder or granulate products. How do you use HG drain and plug unblocker (500 ml)? Complete the following steps to unblock a blocked drain by using this liquid drain cleaner. Pour 300ml of HG drain and plug unblocker down the blocked drain. Leave the drain liquid to work for approximately 30 minutes and rinse with plenty of cold water. In case of a persistent blockage when the drain does not drain at all, let the drain, handbasin or toilet run full of warm/ hot water. Then add 300ml of the liquid to this water, leave it overnight and rinse it the next day with warm water. Avoid contact with the skin and of course keep this product out of reach of children.