Don't know about SHOUT, but at the Ritter-Easley List, more than one poster has suggested and used liquid TIDE detergent to degrease. I have never used a degreaser as I've not blown a head gasket on my MB. Personally, I see no reason to degrease the internals of an engine if water and oil have not mixed.
The powered citric acid can be purchased at a pharmacy.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.