Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to paint cast iron [title] Remove any rust on the cast iron. [step] You may be able to use a wire brush to scrub off the rust. A sandblaster or rust-removing chemical products can also be used if you need to take off a lot of rust and are not worried about possible damage to the cast iron.

Ending1: [substeps] If you don't want to use a paint brush, you can use a toothbrush to clean it away. Always keep all of your brush holders clean and dry before using it to remove the rust from cast iron furniture or finished artwork. Ending2: [substeps] Wear proper safety equipment if working with a power tool or chemical to remove the rust. This may include gloves, goggles and a respirator. Ending3: These products are generally not too toxic unless they are applied with water, but they may be very expensive. [substeps] Rust can be treated with a mineral spirits solution or with canola oil. Ending4: [substeps] The rust can be lifted before you apply any filler. Use a stiff-bristled brush to brush off caked-on rust, replacing as much of the enamel as possible.

Answer format: ending1/ending2/ending3/ending4