To get rust stains out of clothes due to rusty water or hanging wet clothes on a metal hanger put lemon juice on the stain and then put it out in the sun to dry..... the rust will disappear......

Rust stains on countertops..... Make a paste out of lemon juice and cream of tarter put on the stain and try to let the sunlight hit it.... dont know what it is about the sun and lemon juice but it takes rust off really well!