Removing upholstery stain

A pair of new Levis seem to have transferred a significant amount of blue dye onto a light coloured chair (supposedly treated with a stain protection system).
I've used a Vax Rapide XL with some Prochem Extraction Pro (as recommended by TMH) but there's still a fairly bad stain.
Would neat Prochem work, or would it damage the fabric?
Any ideas on what to do next gratefully received.

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