1. Use a chemical rust remover. There are a number of chemical rust removers on the market, most of which are pretty effective. To use a chemical rust remover, simply apply it to the rusted area and let it sit for the amount of time specified on the product label. After the rust remover has had time to work, rinse it off with water and dry the area thoroughly.
2. Use a vinegar and baking soda solution. Vinegar and baking soda are two common household items that can be used to create a powerful rust remover. To make a vinegar and baking soda solution, combine equal parts vinegar and baking soda in a bucket or other large container. Then, use a sponge or brush to apply the solution to the rusted area and let it sit for several hours or overnight. After the solution has had time to work, rinse it off with water and dry the area thoroughly.
3. Use a muriatic acid solution. Muriatic acid is a strong acid that can quickly and effectively remove rust. However, muriatic acid is also a dangerous chemical, so it's important to wear gloves and safety goggles when using it. To use muriatic acid, dilute it with water in a 50/50 ratio. Then, use a sponge or brush to apply the solution to the rusted area and let it sit for a few minutes. After the solution has had time to work, rinse it off with water and dry the area thoroughly.
4. Use a commercial rust remover. There are a number of commercial rust removers on the market that are specifically designed for use on gas tanks. These products are typically easy to use and effective, but they can be more expensive than homemade rust removers.
5. Sand the rusted area. If the above methods don't work, you may need to sand the rusted area. To do this, start by using a coarse grit sandpaper and work your way up to a finer grit sandpaper. Be sure to sand the area until the rust is completely gone. Once the area is rust-free, you can repaint it or apply a protective coating.
6. Replace the gas tank. If the rust is too extensive, you may need to replace the gas tank. This is a more expensive option, but it will ensure that your moped has a clean and rust-free gas tank.
