Currently checking out partially blocked windscreen washers and as part of that have the insulation panel off the underside of the bonnet. I have shaken/lightly beaten out the dirt/dust residue and given the fabric a light wire brushing (its a bit fragile) to take away the worst of the marks.
Just wondered if anyone goes to the extent of treating with perhaps some kind of black product (obviously has to be 100% heat resistant etc) to smarten up appearance?