there's a product reportedly suitable for speaker surround treatment mentioned in the last "Stereophile - Fine Tunes" June 2002 issue, before Skull left the mag.
"Meguiar's #40 Vinyl & Rubber Conditioner".
Scull also mentions a couple of other alternatives:
One Grand Exterior Rubber Treatment
Sonax Trim Protectant
J-10 then goes on to review the positive effects of treating his car's speakers with the Meguiar's
Check it out if desired; the article is even available online if you don't have the issue anymore.
"Meguiar's #40 Vinyl & Rubber Conditioner".
Scull also mentions a couple of other alternatives:
One Grand Exterior Rubber Treatment
Sonax Trim Protectant
J-10 then goes on to review the positive effects of treating his car's speakers with the Meguiar's
Check it out if desired; the article is even available online if you don't have the issue anymore.