Rust Stains on Cloth?

Try CLR or a product called Rust Out. They both work well with colorfast fabric.

Not sure about the UK, but in the States there is a product that I always use called "Whink." It is available in the cleaning product section of most grocery stores and sometimes Wal-Mart. It works great! Good luck!

Apply lemon juice to the stain cover with salt and if posible hang in the sun.