I would not use Benzine or other harsh, volatile chemicals. You could try a mixture of water and a mild dish soap or even better invest in a product that is intended to clean carbon fiber if available in your area.
One that i am familiar with is CarbonPro, i have used their products and known others that have and they seem to work well and are supposed to provide extended UV protection as well as clean and polish. I don't work for them or anything, just the only one i am familiar with.
There website can be found here