Treatment for rubber speaker surrounds?

NON silicon would, in fact, be better.

Audiobugged: the product would be the
"Impedance Enhancer": enhance your spkrs drivers' coupling to the surrounding air...(blurb)... at only 199,99 (1 oz) with special "applicator" brush. The special properties of this fluid (result of 10 yrs confidential research for the Navy, Joint C of Staff, Nasa, my Uncle, & Joe Bloggs) allows it lower or raise the drivers' Q according to the music being played....
Reviews
"...I could never believe the amount of extra performance weaned out of my trusty reference spkrs! In these dire times of snake-oil and voodoo, the question asked is, "should I again jump on the latest tweak in fashion"? The answer is a resounding YES!
I repeat, you don't know what your drivers are capable of until you use this simple fluid..
...Magic? No -- just basic science (confidential for now). Magical? YES!...."

Special introductory offer, 20% OFF for purchases of 2000 bottles or more!!!

I third (is there such a thing) the motion above. Leave the surrounds alone -- or, dust them with a soft cloth or duster fm tie to time.

Some drive units use treated paper, too. Nsgarch, I assume you don't recommend using tap water (or is this immaterial)? Cheers