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.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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