Tooling around the web, found this article. Most of it is probably old hat to y'all, but here it is anyway:
http://www.searchautoparts.com/motorage/technicians/drivability/causes-carbon-buildup-gdi-engines?page=0,0
Has a checklist of safety items when servicing GDI engines also.
http://www.searchautoparts.com/motorage/technicians/drivability/causes-carbon-buildup-gdi-engines?page=0,0
Has a checklist of safety items when servicing GDI engines also.