Heat a glass of table vinegar to boiling point and add soda. After that, apply the mixture to the rust for 3 hours.
Take citric acid and vinegar. Then pour a couple of packets of citric acid into the toilet. It is important that the rusty place is dry. Use a spray bottle to spray vinegar onto the place sprinkled with citric acid.
You can simply sprinkle citric acid on the rust and leave it overnight. Then simply remove the dirt with a brush.
These simple methods will allow you to quickly deal with rust at home without using aggressive chemicals.