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Allow it to soak in for a moment then using a clean rag wipe out the build up. The throttle body service involves cleaning the throttle body with a special cleaning solution and removing carbon deposits from the throttle valve. How To Clean Throttle Body Without Removing It Rx Mechanic As you would expect one of the main reasons why the throttle body needs cleaning is due to the accumulation of dirt and grime within the part which is also known as coking. Throttle body cleaning . Throttle body cleaner is a heavy duty cleaner specially developed to break down hard carbon deposits. Alternatively the WD-40 Throttle Body and. Cost of Cleaning the Throttle Body. Rotate the throttle mechanism and spray the cleaning solvent around the inside of the throttle body. While easy enough to do in theory it can often be done incorrectly and result in an erratic or high idle in your car. While the fuel-injector section is rarely do-it-yourself many people will try and clean their throttle