from the prochem web site
Take safety precautions to avoid infection or contamination. Apply Stain Pro and blot. Apply Rust Remover, wait 2-5 minutes and blot. Allow to react 5 to 15 minutes. Rinse thoroughly with water and blot until dry. It may be necessary to apply a solution of 30ml of Oxibrite per litre of water (subject to colour test).
If you need any assistance give me a call, as i see you are in Devon.
cheers
Paul