"Orange Rot" - AKA Decaying trim under-foam

[Citroënbender]

A quick quessie, has anyone found a way of washing seat trims (taken off the frame and padding) that removes the sticky rotted foam residue without affecting the exterior finish of the cover?

Thanks for any tales of woe or joy, as experienced. 

[Citroënbender]

No takers?  This issue applies further, to the fabric panels on a 147 door trim set.