I had the same problem with the same fabric some years ago. I cleaned with Ultimate Master, which reduces to neutral during the drying process. In my case, some reddish patches appeared in the week following, these increased in numbers and severity over the next 5 months, when the custy called me back to have a look.
Mist sprayed with Sodium Bicarb, lightly brushed in, and the fabric returned to its normal colour within minutes, then left it to dry - no further problems - until its cleaned again, that is.
Dave.