HG kitchen drain and plug unblocker makes quick work of persistent blockages in the sink. The sink can become blocked because of rinsing away food remnants, fat and oil. The sink unblocker liquid works on the basis of natural enzymes and microbes which eat through the blockage as it were and therefore always deal with any kind of blockage.
 
For persistent blockages caused by fat and food remnants
Professional enzyme formula
Biodegradable