I just re-greased my mono wiper system in my 87 300D, and for me, I just followed my instinct. You need to remove the lower windshield moldings, they are clipped in so you just pull them out. From there just unscrew the remaining moldings including the molded plastic bins as well as the four screws that secure the rubber boot under the wiper.

Once you get this stuff out of the way, it will become clearer how everything is put together. It took me 1 and 3/4 hours to remove grease and put it all back together.

I know that you only need to access the blower, but this is a great opportunity to grease the wiper unit as they do wear out a plastic gear rack if not greased in 15 years and I read that they are $1400 new!

For me, the job was much easier than thought, so give it a shot!