We got the call on a Tuesday morning. Homeowner in Chandler, south of Ocotillo Road, said her kitchen sink had been draining slowly for about six months. Not completely blocked — just slow. Water would sit in the basin for a minute or two after she did dishes, then eventually drain down.
She'd been handling it herself with store-bought drain cleaner. Every three or four weeks, she'd pour a bottle of Drano down the drain, let it sit, flush it with hot water, and it would seem to help for a little while. Then the slow drain would come back. When we arrived, she showed us under the sink: four empty bottles of Drano Max Gel in a grocery bag she'd been collecting. That's what six months of the chemical-first approach looks like.
What the Camera Showed
Before we snaked anything, we ran a camera down the line. I want to know what I'm dealing with before I send a cable in — you don't learn anything by just snaking blind, and sometimes you find something that changes the whole approach.
The camera told us what we expected and a little more. There was a grease clog sitting in the drain line past the p-trap — not a complete blockage, but a thick, narrowed passage caked with accumulated cooking grease and food fat. This is the standard kitchen drain clog in an older residential home. People cook, grease goes down the drain, it cools and accumulates on the pipe walls over time, and eventually the flow slows to a trickle.
What the camera also showed was the condition of the p-trap fittings — the chrome S-curve piece visible under the sink. There was visible etching and surface degradation on the chrome, consistent with repeated chemical exposure. The fittings were still intact and functional, but they weren't in the shape they were six months ago. That's the thing about drain cleaners that nobody puts on the label.
What We Pulled Out
We snaked the line with a standard drain cable. When the cable came back up, the clog material was interesting — and I mean that in a plumber way, not in a good way. It was a substantial grease mass, but it had a white crystallized material mixed all the way through it. That crystalline residue is what happens when sodium hydroxide or sulfuric acid-based drain cleaners react with the grease and leave behind mineral compounds. The chemical generates heat, breaks up the surface layer of the clog, and then the byproduct settles into the remaining grease as it recongeals. So the homeowner was pouring Drano down every few weeks, it was temporarily loosening the outer layer of the clog, she'd get a few weeks of slightly better drainage, and then the grease would resettle — now with a chemical residue baked in that actually helped bind it tighter.
We pulled the clog out in two passes. The drain opened up fully after the second pass. We ran hot water through for a couple of minutes and checked the flow — fast, clean, the way it should be.
The Faucet Aerator
While we were at the sink, we checked the faucet aerator — that's the small screen fitting at the tip of the faucet. In Chandler and throughout the East Valley, hard water mineral buildup on aerators is extremely common. This one was partially clogged with calcium deposits. It takes about two minutes to unscrew, clean, and reinstall. We did it. Low-pressure faucet flow is often the aerator, not the pipes — worth checking before you assume you have a bigger problem.
Why Chemical Drain Cleaners Don't Fix Grease Clogs
We talked to the homeowner for a few minutes about what she was actually dealing with, because I think she deserved to understand why six months of Drano hadn't solved her problem.
Chemical drain cleaners work through heat and caustic chemical reactions. Sodium hydroxide (the active ingredient in most gel formulas) creates an exothermic reaction when it contacts water — it heats up fast and aggressively — and that heat can break up organic material like hair clogs. Hair clogs respond reasonably well to chemical cleaners. Grease clogs do not, for one simple reason: grease is a fat, and heat makes fat liquid, not dissolved. The cleaner softens the outside of the grease mass, enough material washes through that the drain feels better for a week or two, and then the remaining grease recongeals and the cycle starts again. The chemical never actually removes the clog — it just temporarily makes it smaller.
Meanwhile, every time sodium hydroxide passes through your p-trap and chrome fittings, it's doing some degree of surface degradation. Chrome-plated brass holds up reasonably well, but nothing holds up indefinitely to repeated caustic chemical exposure. On older plastic fittings, this can accelerate cracking. We've seen it.
The right tool for a grease clog is mechanical removal — a drain snake or, in stubborn cases, hydro jetting. You pull the grease out instead of trying to dissolve it chemically. It's more effective, it's a permanent fix, and it doesn't put repeated chemical stress on your fittings.
What We Recommended Going Forward
We told her to skip the Drano going forward and switch to an enzyme-based drain maintainer used monthly. Enzyme drain products (you'll find them at hardware stores, often labeled as "Bio-Clean" or similar) contain bacterial cultures that consume organic material — grease, food residue — as a food source. Used monthly in small doses, they help prevent buildup from accumulating in the first place. They're slow-acting and they won't clear an existing clog, but as a maintenance product they're legitimate. No heat, no caustic chemicals, no pipe stress.
The other advice: be thoughtful about what goes down the kitchen drain. Cooking grease should go in a container and into the trash — not the drain. Coffee grounds, starchy food debris, and cooking oils are the main culprits in kitchen drain clogs. A mesh drain strainer over the kitchen drain opening is cheap and catches a lot of what causes these problems.
For more on why chemical drain cleaners are hard on Phoenix plumbing specifically, we wrote a longer piece on chemical drain cleaners and Phoenix pipes. And if you want to understand when snaking is the right call versus other methods, our drain cleaning service page covers the options.
If your kitchen drain is slow and you've been pouring chemical drain cleaner down it repeatedly, you probably have a grease clog that the chemicals aren't actually removing — they're just temporarily shrinking it. Stop the chemical cycle before it starts affecting your fittings, and get the line mechanically cleared. Enzyme-based drain maintainers used monthly are a legitimate prevention tool. Chemical cleaners as a recurring fix for grease clogs are not. If your drain is consistently slow despite regular use of drain cleaner, that's your signal to call. The job is straightforward and the fix holds.