The first and most important thing to remember – if you use Draino and it doesn’t work DO NOT use any other do-clogging agents until you contact a plumber. Draino is made with Hydrcholoric Acid. Most other professional pipe 
cleaning agents use Sulphuric Acid. Combining Hydrochloric and Sulphuric Acid is a great way to cause a pretty dramatic explosion. If you use Draino and it doesn’t work, call a plumber. We have seen dozens of customers have bad, even dangerous, results from layering chemicals.
A plumbing note for the future
Draino can be used in slow-running or sluggish drains but if you get to the point where you have standing water in a fully clogged sink, the odds of Draino working go way down. Not to mention that if Draino doesn’t work at this point, now you or your plumber will have to wade through a sink or tub full of harsh and potentially dangerous chemicals to get to that drain. I have had to stop working and take my boots off because the tub water was eating right through them. (On that note, please TELL your plumber is you have already put chemicals in the water!)
Bottom Line
If the sink is still clogged and you have used Draino, or another de-clogging agent, according to directions and recommended usage, it’s time to get a plumber in there with an auger and find out what is inside that drain. They can usually have your water running freely in no time. Contact Wilbur Henry plumbing experts for plumbing help when you need it, where you need it, and we’ll be there.
