Hi Guys.
"Milton" is the most popular brand and as Les said, it is very often used to sterilise baby bottles, but as the name implies, it will sterilise anything. I just buy a generic brand as it's much cheaper than "Milton".
I don't know how I discovered this way of removing curry stains, but it has never let me down yet. Just a couple of minutes on a stain and it lifts off straight away. No scrubbing required. I hope some of you try it and report back to here to let us know what you think.