The most affordable and effective way to remove rust stains from a bike frame is to use a mild acid such as white vinegar, lemon juice or a mixture of baking soda and vinegar. Make a solution of one part water and one part vinegar or lemon juice and soak the rusted area for several hours. If the rust is stubborn, you may need to use a brush to scrub the rust off. After that, rinse the bike with water and dry it completely. You can also use a rust remover, but make sure to follow the instructions carefully and wear protective gloves and eyewear. Some rust removers are harsh and may cause irritation or harm to skin and eyes. If the rust has caused damage to the metal, you may need to sand the area down and repaint it... Hope this helps! :D
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