It's a 40mL container of soap like concentrate available at the dealer for a few bucks. 40mL added to one bottle of washer fluid or (sticks pinky finger in the air) distilled water (puts pinky down) will result in a fluid that cleans the windscreen better, works especially great at high speeds.

Some of you use Rain-X, but I learned a little trick that works just as well. I read about it on a detailing forum. First, you use a claybar and clay the windshield using Stoner's Glass Cleaner as lubricant, and clay the windshield until the clay just glides across smoothly. Apply some more Stoner's for a last cleaning to get off any remaining junk from the claying and wipe the windshield clean with a newspaper or clean, lintless cloth. Apply some regular old car wax to the windshield, and wipe off after it starts to haze. Also make sure you have good wiper blades. You'll find that the water will just bead up, and in light rain, the wind will just let the small droplets of rain glide off the screen. Of course in heavier rain, you'll need the wipers, works best with new blades or blades in good condition.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

This junkie would hate my car as the spray nozzle jets 500PSI of fluid everywhere but my windshield. Then the stupid WW for the headlamps don't spray at all. Also, one headlight wiper works but won't park its useless self back where it belongs like its twin does. Is still have not figured out why. If have to use them at night, I usually park in front of a gas station so I can see the lights in the reflection of the glass, and have to tap the WW so that the rogue wiper parks in the spot exactly when I release the switch. Oh well. There are so many more important things to tackle before my headlamp cleaners are tended too. I wish thats all I had to do.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

X2...Too Funny............

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Matt (SD,CA)

1984 300SD.. White/Chrome Bunts..Green

1997 2500 Dodge Ram 5.9 Cummins 12 Valve 36 PSI of Boost = 400+hp & 800+tQ .. ..Greenspeed

2004 Dodge Ram 2500 4x4 Quad Cab Cummins 5.9 H.O "596hp/1225tq" 6 spd. Man. Leather Heated seats/Loaded..Flame Red....GREENSPEED

Global warming...Doing my part, Smokin da hippies..

Fight the good fight!......

I'd say you earned your seat here based on that fact alone: You made the windshield washing system your FIRST job on a diesel, lmao, normal guys will change the oil first.

Very funny post, I found it looking for a good windshield cleaner as I have become obsessed with getting my windshield perfectly clean...permanently. Whenever I sneeze or cough, I find myself driving to lighted gas stations (employing the flashlight as well) to find the flem or saliva that made it to the windshield.

I am currently looking for the "best" windshield cleaning formula and method...still keeping my behavior within control so nobody is worried about me yet. Hopefully I will find the perfect windshield washing method and product tonight.