Can You Put Liquid Plumber in a Washing Machine? (Don’t Risk It!)

If your washing machine isn’t draining properly, you might be tempted to reach for a quick fix like Liquid Plumber. After all, it clears clogs in sinks and showers—so why not your washer? But before you pour it in, it’s crucial to understand: Can you put Liquid Plumber in a washing machine? The short answer: No, it’s not recommended. In this guide, we’ll explain why, what could go wrong, and safer alternatives that actually work—without damaging your machine or voiding your warranty.

Why You Shouldn’t Use Liquid Plumber in a Washing Machine

Liquid Plumber is a powerful chemical drain cleaner designed for household plumbing like sinks, tubs, and showers. It typically contains sodium hydroxide (lye) or sulfuric acid, both of which are highly corrosive. While effective for pipes, these chemicals can wreak havoc on the delicate components inside your washing machine.

According to the U.S. Consumer Product Safety Commission (CPSC), chemical drain cleaners cause over 3,000 injuries annually, many involving improper use on appliances. Washing machines contain rubber seals, plastic hoses, and electronic sensors—all vulnerable to chemical degradation.

Expert Insight: “Using harsh drain cleaners like Liquid Plumber in appliances not designed for them can melt internal tubing, corrode metal parts, and even create toxic fumes when mixed with detergent residue,” says Maria Chen, a certified home appliance technician with 15 years of experience.

What Happens If You Accidentally Use Liquid Plumber in Your Washer?

Even a single use can lead to serious consequences:

• Damaged rubber gaskets: Causes leaks during cycles.
• Corroded pump impellers: Leads to drainage failure.
• Residue buildup: Reacts with laundry detergent, creating sludge or foul odors.
• Voided warranty: Most manufacturers (like Whirlpool, LG, and Samsung) explicitly prohibit chemical drain cleaners in their user manuals.

A 2023 study by Appliance Repair Insights found that 22% of premature washing machine failures were linked to improper chemical use—many involving DIY drain cleaner “hacks” found online.

Safe Alternatives to Unclog a Washing Machine Drain

Instead of risking damage with Liquid Plumber, try these safe, effective methods:

1. Manual Drain Hose Inspection

• Unplug the washer.
• Locate the drain hose (usually at the back).
• Place a bucket underneath and disconnect the hose.
• Check for lint, coins, or debris. Flush with hot water.

2. Vinegar & Baking Soda Flush

This natural combo breaks down mild buildup without corrosion:

• Pour 1 cup of baking soda directly into the drum.
• Follow with 2 cups of white vinegar.
• Let it fizz for 30–60 minutes.
• Run a hot water cycle (no clothes) to flush the system.

⚠️ Note: This won’t fix severe clogs but works well for maintenance and odor control.

3. Use a Washing Machine Cleaner

Products like Affresh or Tide Washing Machine Cleaner are specifically formulated for appliances. They dissolve soap scum, lime scale, and biofilm without harming internal parts.

4. Check the Pump Filter

Most front-load washers have a cleanout filter (usually behind a small panel at the bottom front).

• Place towels down (water will spill).
• Unscrew the filter cap slowly.
• Remove debris like hair, coins, or fabric scraps.
• Reinstall and test.

For detailed instructions, refer to your owner’s manual—or consult your brand’s support site.

Liquid Plumber vs. Washing Machine-Safe Cleaners: A Quick Comparison

Source: Manufacturer guidelines & EPA Safer Choice Program

When to Call a Professional

If your washer still won’t drain after trying the above steps, the clog may be in the household drain line—not the machine itself. Signs include:

• Water backing up into the sink or floor drain
• Gurgling sounds during spin cycle
• Multiple appliances draining slowly

In such cases, contact a licensed plumber. They can use a drain snake or video inspection to locate and remove blockages safely—without risking your appliance.

For more on household plumbing systems, see Wikipedia’s overview of drainage systems .

FAQ Section

Q1: What if I already put Liquid Plumber in my washing machine?
A: Run 2–3 empty hot water cycles with no detergent to flush the system. Monitor for leaks, strange noises, or error codes. If issues persist, contact a technician immediately.

Q2: Can Liquid Plumber damage my clothes?
A: Yes. Residue can remain in the drum and react with fabrics, causing discoloration, holes, or skin irritation—especially with delicate or synthetic materials.

Q3: Is Drano safer than Liquid Plumber for washers?
A: No. Both contain similar corrosive ingredients. No chemical drain cleaner is safe for washing machines, regardless of brand.

Q4: How often should I clean my washing machine?
A: Every 1–2 months for front-loaders (prone to mold), and every 3 months for top-loaders. Use a dedicated cleaner or vinegar/baking soda routine.

Q5: Can a clogged washing machine cause flooding?
A: Absolutely. If the pump can’t drain water, overflow during the spin cycle can lead to significant water damage—especially on upper floors.

Q6: Are enzyme-based cleaners safe for washers?
A: Yes! Enzyme cleaners (like Bio-Clean) use natural bacteria to break down organic matter. They’re non-corrosive and safe for all washer types.

Conclusion

So, can you put Liquid Plumber in a washing machine? The clear answer is no—it risks costly damage, safety hazards, and voided warranties. Instead, opt for washer-safe cleaning methods like vinegar flushes, dedicated appliance cleaners, or manual filter checks. These approaches protect your machine, your clothes, and your home.

Your washing machine is a major investment—treat it with care! If this guide saved you from a plumbing mistake, share it with friends or family who might be tempted by a “quick fix.” A little knowledge goes a long way in keeping your laundry running smoothly.

Got a clogged washer story or tip? Drop it in the comments below!