[Porsche-O-Phile]

I'm a little reluctant to use Simple Green as it's an aluminum head and I've heard some things about aluminum/magnesium alloys experiencing hydrogen embrittlement when exposed to highly alkaline substances (like S.G.) for extended periods. I'm probably way overthinking this and being paranoid but just a thought...

I'll try some of those ideas. Don't have a blasting cabinet unfortunately - just a standalone blaster which would make a heck of a mess.