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Originally Posted by Big Damo
Subaru has their own product to combat this called "Upper Engine Cleaner", you spray half the can into a vacuum hose on the inlet manifold, start it up and it chugs and churns out massive amounts of white smoke from the exhaust, keep the revs up and spray the rest of the can in the hose and it cleans up the inlet manifold and carbon build up elsewhere.
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The Subaru carbon cleaner wasn't designed to solve this problem on DI engines as Subaru have never had a DI engine until the BRZ was released a month or 2 ago.
But it does the same job on a non DI engine as it would on a DI version. Ford have there own version from Motorcraft called Carbon Clean.