Sonus Faber recommends silicone spray on a microfiber cloth to treat rubber surrounds on the speaker drivers. Have any of you done this? I am hesitant knowing that a lot of silicone products contain petroleum distillates that might shorten rather than extend the life of the rubber. I have owned Strads for several years and all I do is dust the drivers with a very soft brush. The surrounds still appear to be in good condition.
