If it is anything like the 300se 1989, just push up the nozzle and move it at an angle out.
push from under hood after clearing the hoses.

edit--- It may be a matter of pushing down from above. Don't recall. Try both carefully. It is not compliicated.

all you need to do is remove the existing nozzle and clean it with 'CLR' cleaner. Do an archive search.
I archived my process.
Fixed mine. boaf of 'em.

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD