Russ, years ago when I was an apprentice with Mack Trucks ( not actually Macks but a large dealer) I got the job of rebuilding our workshop EH ute engine, cant think what model red motor it was.
Dont know where I got the idea from but it was probably one of the older mechanics, it was to slowly pour rice down the carby throat while keeping it running. Engine was clapped anyway so not much
to loose. Next day after removing the muffler and armed with a small bag of rice I went about to decoke the engine. By this time near everyone around was looking on. Needed near full revs to keep it
running and it made noises that I never heard before, backfired and left burnt rice all over the workshop floor. Guess who had to clean it up haha! Well it decoked the engine beautifully and showed no
signs of mechanical damage, dont think the high compression engines today will handle that.
On another note back then we used to feed bon ami into the inlet on diesel engines to reduce oil consumption, mainly on the V8 Macks, from memory they needed it at about 60,000 miles. Never
on customers engines tho, my Dad had two V8s.
I DO NOT RECOMMEND IT ON ANY AIRCRAFT ENGINE OR ANY OTHER MODERN ENGINE.
Steve