Bars and iron objects tend to rust. To clean them without sanding, you will find on the market called neutralizing rust.
These products are a kind of oil that is applied with a brush on the oxidized zone and produces a chemical reaction that removes rust. The amount to use in each application is very small.
In any case, even the rusty iron lijes not, remember that dust is the great enemy of any repairs, so before applying the product should clean the surface to be treated. Once the neutralizer has dried oxide, should be given a coat of enamel. Choose a variety with an antioxidant treatment and prevent recurrence.