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will update later NT 03:08, 2 September 2014 (BST)
FAQ at http://wd40.com
"What surfaces or materials are OK to use WD-40(tm) Multi-Use Product on?"
"WD-40(tm) Multi-Use Product can be used on just about everything. It
is safe to use on metal, rubber, wood, and plastic. It can also be applied to painted metal surfaces without harming the paint. Polycarbonate and clear polystyrene plastic are among the few surfaces on which to avoid using a petroleum-based product like WD-40(tm) Multi-Use Product."