Originally Posted by doubla_d
Wow!! I'm very surprised it wasn't cleaner then that! The before and after picks of walnut blasting at other shops are night and day... Right to the metal!
Maybe he brush cleaned it by hand and not with walnut shell? It is by far much cleaner but still not completely carbon build-up free
They definitely walnut blasted the intake valves. you can see the bits of walnuts in the pics on the edges of the valves and there are walnut bits in little places in my engine bay they didn't clean out.
I'm guessing it's because its a discounted rate they spend as little time as possible on the car so they did the minimum.