I've been trying to clean 2 chair cushions while we're locked down - both Ikea Poang chairs, so the covers are removable and can be machine-washed. But both of them have stubborn stains (in places I can't easily hide) which I've not yet been able to get out. So far I have tried: Normal machine washing with standard detergent; Spray-on stain remover (Sainsbury's - it's often quite good for greasy spots); Vanish stain remover bar (rubbed in and left for a while before washing again); and a Dr. Beckmann's stain remover bar from my mum, as well as leaving them in the sun for a while - but the stains have got a bit paler but are still quite visible.
I don't know what the stains are - one is orangey so may be curry or something tomato-ey, the other is brown so possibly something like gravy or strong coffee. Can't use bleach as they are both coloured - the first one is blue and the second is a beige fabric with a print of green and brown leaves (unfortunately the stain is in a beige section).
Is there anything else I could try to get them out? Ideally something I might already have or can reasonably easily get hold of. Thanks in advance!