Unclogging drains with baking soda and vinegar, without using chemicals. A lot of people think plumbing is all blocked toilets, but the whole time i've been doing my apprenticeship i've only had to unblock two or three, so it's not all dirt and muck," says plumber josh boyce. Derby de1 emergency blocked drain clearance, cleaning & repair. Gas credit exclusive for sse energy customers. Need a cctv drain survey? drain doctor.