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Toilet cleaner will do. It is sold in major supermarkets and shopping malls.
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You can use toilet cleaner or detergent.
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The most economical is water and vinegar.
1.Mix a cup or 250ml of white vinegar with a little baking soda powder and pour it into the toilet, wait for 10 to 15 minutes, then wipe off the stain with a long-handled brush, and then rinse with water. >>>More
Go to a store that specializes in buying hardware and buy a bottle called "toilet cleaning water"; >>>More
Toilet cleaner, toilet cleaner, toilet brightener, etc., all brands have good results.
Go to a chemical store and buy a diluted hydrochloric acid wash, but it's best to wash it twice.
Buy a bottle of oxalic acid, dilute it with water, pour a little on it, and then brush vigorously with a brush.