Thank you for the advice and tips on cleaning the fabric.
I started first with a 50/50 mix of vinegar applying with a spray bottle. Using a soft brush, I worked it in to the fabric. I then let it set for a couple hours and then used a shop vac to remove a lot of the moisture. I waited till the fabric was totally dry and then I repeated this process. After three applications it now looks much better.
I am really grateful for all the tips and ideas.
Much appreciated, Paul
Comox, BC, Canada