Try baking soda and water.
Baking soda can help to break down the rust. Apply baking soda to the rusty area and use a brush dipped in water to scrub the rust off the painted surface. Scrub gently so you do not damage the painted surface.
Correspondingly, how do you remove rust without damaging paint?
WD-40 is designed to loosen the bonds between rust and the metal surface it has adhered to by penetrating the porous layer of rust and using its lubricating properties to loosen it. To remove surface rust, simply spray it on the rusted surface, leave it for around ten minutes and let it get to work on the surface rust.
Furthermore, how do you remove old rust stains?
To remove rust stains from clothes, mix a few drops of hydrogen peroxide together with a teaspoon of tartar cream and baking soda. Apply the resulting paste onto the stain, let it sit for 30 minutes, then rinse it thoroughly and wash the clothes as usual.