Read Evan's post three times - this goes for any cleaner, wax, lubricant, "shiney-upper", or rejuvenator.
Normal/standard/original WD-40® Multi-Use Product does not contain silicone; however, by popular demand/ignorance WD-40 sells many other silicone-containing products (one obvious example: WD-40 Specialist Water Resistant Silicone Lubricant).
