Whatever form of VooDoo/HooDoo Juice you end up using; IT MUST BE COMPLETELY RINSED OUT OF THE COOLING SYSTEM.

Detergents in the Mercedes Cooling system are used as a "De-greaser".
[A.K.A. "Dawn Dishwashing Detergent"]

Then the Dreaded "Citric Acid Flush" is performed.
(MAY do more harm than good? 'Jury's still out .)

I can empathize with your trying in an innovative fashion to "Enhance" your
"Water Flush".

BUT, as mentioned there are surface contact enhancers that are Purpose made
to be used.("Purple Ice" , "Water Wetter" . Etc.,Etc.)

As much FUN as the Mercedes Cooling System Maintenance Circus is...
(AND AS CRITICAL as it is in some engines)
I'd not enter ANOTHER Snake Oil derivative of UNKNOWN actions into the Mix
without completely investigating it's TOTAL effects.

Sorry to Rain on your "System" development.

as always: Your Mercedes, Your Pleasure!

__________________
'84 300SD sold
124.128