Consumer Reports has no financial relationship with advertisers on this site. The process of walnut blasting, which entails cleaning the intake manifold and valves of a car’s engine with a high ...

Composition Materials has been a leading supplier of crushed walnut shell grit products for more than 50 years. In the 1960s, the company pioneered an innovative coating removal blasting technology ...

The other day I dropped my car off at a European specialist shop, and while I was there, a technician was working in the engine bay of a Mk7 Golf R, cleaning out carbon deposits off the intake valves.