THe removal of chili or curry stains is often quite difficult, due to the amount of fat that is in the solution, To see this let the curry cool and you will see it floating on the surface. So remove the fat first with a solvent white spirit or a mixture of petroleum ethers, vacuum this away with your machine and then treat with a high pH pre spray, Most of the colour will come away with the fiirst treatment. repeat and then leave to dry.