1950's Grille Cloth Cleaning
This is my first post so be gentle. I'm a big fan of 1950's and early 60's audio so that naturally includes vintage JBL. I picked up a speaker over the weekend that has smoke stained grille cloth. My concern is keeping this speaker original and doing no harm if I decide to try and clean the cloth. It has a light coffee color to it instead of the off white it should be. Has anyone had good luck cleaning grille cloth like this? I would rather leave it alone than risk destroying it.
Thanks for any advise you can give.