Toilet Urine Stains Won't Come Off? Bleach Doesn't Work! Cleaning Experts Recommend 'One Affordable Solution' That Cleans Effortlessly Without Scrubbing

Stubborn stains in toilets sometimes won't come off no matter how hard you scrub, likely because the cleaning method isn't targeting the root cause. Recently, a net user posted online seeking help, revealing a ring of black grime stuck deep inside their toilet drain. Despite repeated vigorous scrubbing, the stain remained, causing great frustration. The post quickly sparked heated discussion, with many热心 netizens generously sharing various toilet-cleaning hacks. Among them, an expert pointed out that such stubborn urine scale can only be effectively broken down using 'acidic substances,' and openly shared their cleaning method.

Can't remove black toilet stains? Experienced users swear by 'citric acid' — leave it overnight and tough grime falls off automatically

A net user posted a photo in the Facebook group 'Landlord Mutual Aid Society.' The image clearly showed a large patch of black grime stuck deep inside their rental toilet. Helplessly, they asked, 'There's deep staining in my toilet, and I've cleaned it for a long time but can't remove it. Does anyone have a good method?'

Immediately, experienced users stepped in with advice. One revealed they had previously tried common mild cleaners like baking soda, sodium percarbonate, or bleach, but saw almost no results. Later, they switched to 'citric acid,' pouring in half a packet at once and letting it sit in the toilet for at least 12 hours. After that, a light scrub was enough — the grime almost entirely detached. If any minor stains remained, simply repeating the same process once more would do the trick.

Others also shared hands-on experiences. One user said they had just cleaned a dirty toilet last week. Their trick was first using a sponge or cloth to thoroughly dry the moisture inside the toilet drain, then pouring in hydrochloric acid, letting it sit for about 10 minutes, and gently wiping with a sponge. They witnessed firsthand how years-old black grime peeled off in fragments. However, they gave a strong warning: hydrochloric acid is highly corrosive and must never be left too long, or it could damage the ceramic surface of the toilet.

How to make your own natural toilet cleaner? Experts reveal the perfect golden ratio of lemon juice and white vinegar

The cleaning product brand 'Koboku Mukanzi' previously shared tips on its official website, stating that using 'citric acid' to make a homemade cleaner is highly effective against urine scale, limescale, and stubborn black stains in toilets. This is mainly because citric acid's weak acidity efficiently breaks down mineral deposits and urea crystals. Additionally, its fine crystalline particles provide slight physical abrasion during scrubbing, making it easier to remove tough stains.

The website also revealed the ideal mixing ratio for this natural cleaner. First, squeeze fresh lemons and filter out all pulp to obtain pure concentrated lemon juice. Then, pour an appropriate amount of white vinegar into the lemon juice and mix thoroughly. However, the article ends with a special warning: this acidic cleaner should be avoided on toilets with special coloring or sensitive surfaces to prevent discoloration or corrosion.

Responsible Editor／Tsai Hui-Hsin