I laid them all in old enamel grill pan, poured the vinegar over, melted the salt as best I could with boiling water and poured and spooned (!) this on the fabrics. I then put it all in a thick see'through polythene bag to keep air out and put it in the greenhouse - and promptly forgot about it. Six days or so later I turned them over, some pieces on top of others, then about four days later (last night) I washed them out. I was amazed to see this thick glorious oily coloured stuff on the fabric, but unfortunately it all washed off. Just as well really, as I imagine if it didn't the fabric would have rotted away eventually. It may still do that, but in the meantime I am quite excited with what I achieved. Thanks Mags.!