Sometimes it pays to "get the man in" ?
Phone your local Bentley service department and ask them who they recommend for renovation of interiors. In many cases they have a small specialist that does all the cleaning and restoration who is a wizard and actually turns out quite good value.
I had a friend with a MB Nappa+ interior which got hit by three pairs of wet jeans and turned a funny colour. They used the local Bentley contact and it was near perfect.
The knowledge they have of these problems can save a lot of time.
Just a suggestion.