The spray nozzle heads on these get pretty gummed up and clogged as well over the years. You can take a sewing needle and poke away any built up crusted washer fluid. You can also pop them out all together and replace with new ones, cheap enough. You can then use the sewing needle to aim the nozzles, which are little ball & socket arrangements. Might want to bleed the air out a little also. I got mine working pretty good on my 250C years back, but overall it's pretty weak, nothing like the modern electrics of today.

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Present
1971 280SE W108

1967 250SE W111
Rhode Island
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Auf Wiedersehen
1972 280SE 4.5 (AKA Das Moneypitten)
1972 250C (Mit den zwei carburetors from hell)

"Time fly’s like an arrow, fruit flies like a banana" Groucho Marx