Blitz That Blockage Bathroom One Shot Pack 5 "Worked where others products had failed." Amanda 12 January 2020 The tap in one of our sinks is slow & takes ages to run hot so the sink was very slow to drain due to build up. Worse still I can't get the push up/down plug top to unscrew! Previous products made little difference. This one improved drain speed a fair bit with the first shot & with a second shot it was totally clear. Fast acting & Great that there's no horrid chemical smell. A tad tricky to pour all the granules down the plug hole given I couldn't get the plug top off, but because they are dry I was able to brush them down from the sink without risk of them tarnishing the metal plug rim.