[Sobieski]

I regularly clean up old metal hoods with soap and water, or 'white spirit' (oil paint thinners/turpentine), or even metal polish as required, all with no ill-effects. (These are usually ok for plastic hoods too). As for matt black inners, I repaint using standard auto-shop spray paint or 'blackboard paint' after masking off with tape. But I find chrome is generally impervious to cleaning - that is, it doesn't usually look any better after a clean than beforehand, apart from shifting the grime .... Alan