What do I soak the fuel distributor in to clean it without destroying the seals and o-rings?

It's an W124 1988 300TE (M103) with a no start condition....It will try to start when gas is sprayed in the intake, so spark is there. I also have fuel pressure at EHA, distributor inlet, and outlet but nothing coming out of the top of the fuel distributor to the injectors when cranking with the air plunger depressed. I don't care if its not perfect, Limp mode would be good enough. I just want it to run so that I can judge basic condition of engine and drive train before it gets parted out.

Thanks!

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon