If you have a blocked sink in St Mark's, Gloucestershire, the most effective and simple solution is to try unblocking it yourself. You can use traditional methods such as a plunger or bend with towel assistance, but often this will not work or clear the blockage completely. For more stubborn issues its best to get specialist help especially if there are underlying problems caused by tree roots invading pipes etc Some common solutions tried to include pouring boiling water down your plughole; using vinegar and baking soda mixture (follow instructions carefully); putting half cup of detergent powder into 1 litre of hot boiling water then pouring that down your sinks plug hole; buy chemical based products which dissolve build-up from fats, greases & oils within drain systems ;using an electric eel/snake method available for hire at hardware storesor lastly calling out drainage engineers who carry full field test equipment should all other attempts fail.