Got a problem with your boiler? Pour / cup baking soda, followed by / cup vinegar down drain plug drain, and let sit for one hour then, pour a pot of boiling water down drain repeat if necessary. It's so great to be able to keep drains clear without toxins! Alternatively, to fill out our contact form. Clean blockages without damaging your pipes! A new israeli da-vinci unmanned aerial vehicle manufactured by elbit systems is displayed during the th international conference on home land security and.