A blast of walnut shells through the engine will clear those deposits right up. You can also use seafoam as a preventative measure to burn off any excess deposits.

If you want a performance boost, you can get a methanol-water injection added to your engine which should boost hp output while burning off those deposits. Just be careful with meth, if the mixture is not present engine temps will skyrocket leading to knocking and detonation very shortly afterwards. A properly integrated fuel-cutoff system will prevent this but you must ensure your meth controller has this functionality otherwise you are taking a great risk IMHO