MythBusters · Video summary

Are Hand Dryers Really Cleaner Than Paper Towels? | MythBusters

MythBusters investigates the hygiene of public restrooms, testing whether hand dryers are less sanitary than paper towels and which toilet stall is the cleanest.

MythBusters · September 10, 2026 · 22-min episode · 4-min read

Are Hand Dryers Really Cleaner Than Paper Towels? | MythBusters

Key takeaways

💨The myth suggests that hand dryers are less sanitary than paper towels because they purge fewer pathogens and can spread microbe-laden air.00:56
🧼Proper hand washing with soap and water eliminates virtually all bacteria, making the drying method irrelevant if hands are washed correctly.01:23
💧When only rinsing hands with water (without soap), a significant amount of bacteria remains, representing a worst-case scenario for testing drying methods.04:22
📉Paper towels reduced bacterial load by 71%, while air dryers only reduced it by 23%, indicating paper towels are far more effective at removing bacteria.12:38
🦠Air dryers spread more bacteria into the surrounding environment (41 colonies) compared to paper towels (3 colonies).12:54
🚪The myth proposes that the toilet stall closest to the door is the cleanest because people avoid it, assuming it's the most used and dirtiest, or seeking more privacy.15:33

Chapters

0:00Introduction to Toilet Myths
1:56Hand Washing Baseline Test
7:15Setting Up the Restroom Experiment
11:45Bacterial Application and Swabbing Protocol
20:23Results of Hand Dryer vs. Paper Towel Test
22:00Introduction to the Cleanest Stall Myth
23:37Setting Up the Stall Usage Experiment
35:12Results of the Cleanest Stall Test

The digest

Public restrooms are a necessary evil, often approached with a mix of caution and mild disgust. But beyond the obvious visual cues, what hidden truths lie within these communal spaces? MythBusters, ever curious about the unseen and the unverified, delved into two prevalent myths surrounding public restroom hygiene: the cleanliness of hand dryers versus paper towels, and the surprising theory about which toilet stall is the least used and therefore the cleanest.

The Hand Dryer vs. Paper Towel Showdown

The first myth tackled the seemingly modern and sanitary solution of electric hand dryers. Many believe these high-tech devices are a more hygienic alternative to traditional paper towels, but a counter-myth suggests they might actually be less sanitary. The theory is twofold: hand dryers supposedly purge fewer pathogens than paper towels, and they can also fan a fog of microbe-laden air, turning a simple hand-drying experience into a “contamination catastrophe.”

Before diving into the experiment, the team first had to establish a baseline for hand cleanliness. They identified three common hand-washing behaviors in public restrooms: pretending to wash hands (just running water), getting hands wet but using no soap, and properly washing hands with soap and water. To test the efficacy of each, Adam and Jamie washed their hands using these three methods, and then swabs were taken and cultured. The results were stark: washing hands with soap and water yielded no detectable bacteria, while simply rinsing with water or pretending to wash left significant bacterial loads. This crucial finding led to the decision to use the “water rinse only” method for the main experiment, as it represented a realistic worst-case scenario for bacterial spread, ensuring that any differences in drying methods would be clearly attributable to the dryers themselves, not the initial hand-washing effectiveness.