SHOUT for coolent flush? MB recommended!

[Mr Goodfahrt]

1982 300D

While attending a MB tech session at our local dealer they mentioned using SHOUT (that's right... the stuff you get in the grocery store) for flushing out the cooling system. They use it 1:1 or 1:3 depending on how dirty the system is. They use it when they have fixed a head gasket etc. I confirmed this with a 2nd MB dealer!

Has anybody else heard this?

The MB CDs do say that before using any chemical scale removing solution that it is necesary to de-oil the cooling system but they don't say what to use. They do suggest a 10% citric acid solution for the descaling. Where can we get this? I know that white vinegar is 5% ascetic acid, but don't know if this would work.

Thanks... Mr Goodfahrt