I did the cleaning myself a few weeks ago, it's honestly not that hard, if your somewhat mechanically inclined do it your self!
I made my own tool lol,I found a vacuum brush laying around without the bristles, it fit perfectly into the intake port, so what I did was drilled a hole to insert the walnut blaster into, so with the vacuum on I would walnut blast and the particles would be sucked up, making the mess minimal.
Vacuum brush was sort of this shape https://www.amazon.com/gp/aw/d/B00VLWJITK/ref=psdcmw_11333718011_t2_B00SA5FGUQ
I did mine a few weeks ago just with carb cleaner, picks, "the zip tie tool" and my shop vac. I wouldn't mind doing it this way again its pretty easy I would do it again. You can close 3 cylinders at once so its easy to soak multiple at once. Picks to get off the big chunks first, then soak it in solvent. Zip tie tool to scrape after soaking, then I sucked up the soup with my shop vac and repeated.
Great idea. How well did it work for you? Did it remove it all or did you have to go back in with the chemicals and hooks/pics?
What's the zip tie tool?? I'm thinking about attempting this once I reach the 70k mark.
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Take about 30 heavy duty zipties and bundle them together with another ziptie or two and you use the ends as a brush to clean the valves. Just a quick little tool you can make to assist in carbon cleaning. Not necessary but it works good. I read about it on a few forums and humblemechanic mentioned it in a video recently.
The walnut blaster took about 90% of the gunk off, I sprayed the left over carbon with CRC valve cleaner and used a pick to scrape it off, the CRC cleaner works amazingly well, I just sprayed it and immediately picked off the carbon without letting it soak.
Has anybody made one of those BMW walnut blaster attachment tools for our cars yet? That seems like the least annoying way to deal with gunked up valves.
You're getting quotes $950 for a carbon cleaning ? Best I got was $350 CAD for a walnut blasting.