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Thanks for all your help.
I will try Annie's suggestion first, but I wonder that considering the whole suite consists of 13 different pieces, i.e. 1 couch cover, 2 chair covers, 5 back cushions, 5 seat cushions, then perhaps I could do them in the washing machine say in 5 washes using the same amount of cold dye each time as the machine will produce the same amount of water each time.
If all that fails, I will take onlyone's advice and go for a new suite. Happy New Year to you both. Regards Trish.