One Shot vs Caustic Soda: Which Clears Drains Faster?

If you clear drains for a living, the question isn't which product is "strongest" — it's which gets the line flowing fastest with the least mess. Here's how the common options stack up.

Caustic soda

Cheap and widely available, caustic soda (sodium hydroxide) works on grease and organic matter, but it's slow, has to be mixed and dosed carefully, generates heat, and often only partially clears a heavy blockage — meaning a second visit. It's a general-purpose option rather than a fast fix.

Rods and augers

Mechanical clearing is essential for solid obstructions and blockages further down the line, and it's chemical-free. The downside is access — rods can push a blockage along without fully removing the grease and build-up that caused it, so the problem can return.

One Shot Instant Drain Cleaner

One Shot is the trade's go-to for fast organic clearance. It dissolves grease, hair, soap and paper rather than just breaking through, and works in minutes when used correctly. For the typical grease/soap/hair blockage in a sink, toilet or floor drain, it's the quickest route back to a free-flowing line — and a monthly preventative dose stops the call-out repeating.