Been there, done that. Spray it out good with a thin oil such as WD-40 to wash it out, then a day or two later after that has dried out re-spray with lithium grease. Resist the temptation to spray the lith grease first because it will mix with the dirt and make it harder to remove.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition