Ah, this is one of those household “tricks” that sounds odd at first—rubbing onion on windows isn’t about cooking, it’s about cleaning and pest control. Here’s the real explanation:

Why You Should Start Rubbing Onion on Your Windows

1. Natural Cleaner

Onions contain natural sulfur compounds that can help break down dirt and grease.
Rubbing a cut onion on glass can remove stubborn streaks or water stains.

2. Prevents Pests

Some people report that onions can deter insects like flies and mosquitoes from landing on windows.
The strong odor is unpleasant to many pests but fades quickly for humans.

3. Anti-Fogging Effect (Traditional Tip)

The juices of onion may leave a thin film that can slightly reduce condensation on windows.
It’s similar in concept to rubbing a cut potato or vinegar to prevent fogging.

4. Eco-Friendly and Cheap

Uses a natural, biodegradable product, so it’s safe for the environment.
Reduces the need for chemical cleaners or sprays.

How to Do It

Cut an onion in half.
Rub the cut side gently on the window surface.
Wipe off excess juice with a soft cloth.
Optionally, rinse lightly with water to remove residue.

Bottom Line

Rubbing onion on windows is an old-school, natural cleaning trick that can help remove streaks, deter insects, and even reduce fogging slightly. It’s not magical, but it’s cheap, safe, and surprisingly effective for some minor household tasks.

If you want, I can make a list of 5 more weird but effective natural cleaning tricks for around the house—like onion, vinegar, and baking soda hacks. They’re surprisingly handy!

Do you want me to do that?