Find a plug to seal one of the holes. Squirt injection cleaner in the other. Shake it and set it up so the cleaner doesn't run out. Let it sit for four hours, shaking it a couple of times. Dump the cleaner out. Repeat until the fluid comes out clean.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe