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It's perfectly safe to allow the car the redline occasionally. The redline is determined by where the engine develops its peak HP, and the mechanical limits of the drivetrain. Most cars employ a rev limiter, which cuts fuel beyond a certain RPM, usually a couple hundred RPM after the redline. This is a safety feature that will not allow the engine to rev beyond its limits to prevent damage.
As far as cleaning out carbon, I would argue that you don't really need to go all the way up to redline to accomplish the goal. A few brisk accelerations up to about 60-75% of the rev range will work just as well. There are plenty of products like seafoam that are designed to do the same thing, without potential damage to your engine.
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