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Cost me only my time to take the manifold off and clean it myself. I'm a bit skeptical of these sorts of treatments although happy to be proven wrong.
When I cleaned the manifold even with a pressure washer the crud was hard to remove and physically involved using a screwdriver/blade to scrape away as much as I could.
I didn't do the intake ports though as IMO those are more suited to walnut blasting.
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if I've helped - an Appreciate would be, er, very appreciated!
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