Clogged sinks are caused by a build up of debris down your plughole. In kitchens the build up is food particles and grease, in bathrooms it is hair and soap sludge. You need different product formulations to tackle these different products. Bathroom blockages should be treated with Bathroom Plughole Unblocker. To blast kitchen blockages use Kitchen Plughole Unblocker. Both products sink through standing water straight to the cause of the blockage and will leave your pipes clear and clean.