As for rotating the engine between cylinders, we jacked up the back end, put the manual tranny' into gear and turned the wheel.
It took one day per cylinder to soak CRC overnight, scrape, soak again, scrape again, brush, blow clean and dry. Next cylinder.
We also used oven cleaner when we ran out of the CRC and it removed pretty well but not as good as the CRC.
Heating the valve and opening with a heat gun while soaking seemed to help but the heat evaporates the CRC too fast. Heating while scraping also seemed to work on stubborn build up. But not positive it helps.
The whole cleaning process whether using blast media or scraping is a tedious, messy, unpleasant process. I would pay someone to do the cleaning if I could find a shop that I could trust and or if the cleaning didn't cost so much.