The fuel residue I've seen the last ten years or so in North America would absolutely die laughing at this sort of cleaning attempt. About 4 hours in the ultrasonic with some pretty serious cleaning fluid is generally required to do the deed.
Hi, I wonder if you can help ? My engine starts up fine but after about 20 mins the tick over starts to go up to around 2 and half thousand. Someone suggested that "something" is sticking.What will it be ?