Katana Owners Club U.K.

Can anybody tell me if you can and if so how to soften a seat cover?
As part of my seat cover has gone hard, it's the pvc type.

Late reply - but its bad news I'm afraid.
The problem seems to be that the plasticisers (?) in the original vinyl gradually degrade and the material gets harder and less flexible, and there doesn't seem to be any way of restoring the material again.
I've tried a whole range of chemicals - 3M vinyl cleaner/restorer, white spirit, WD40, Gibbs, anything else I could find... Nothing made a noticeable difference.
I've asked traders at custom car/bike shows... Nothing.
A recover with new material seems to be the only sure answer.

Cheers for the reply

its the uv in sunlight that does it.