Mercedes-Benz 2007 G-Class Operator's Manual page 277

Operation
Engine compartment
Use the tab to pull cap 1 upwards.
Refill the reservoir with MB Windshield
Washer Concentrate "MB SummerFit"
and water (or commercially available
premixed windshield washer
solvent/antifreeze, depending on
ambient temperatures).
!
Always use washer solvent/antifreeze
where temperatures may fall below freezing
point. Failure to do so could result in damage to
the washer system/reservoir.
!
Only use washer fluid which is suitable for
plastic lenses. Improper washer fluid can
damage the plastic lenses of the headlamps.
Press cap 1 on the filler neck until it
has completely engaged.
For more information on filling up the
washer reservoir, see "Windshield/rear
window washer system and headlamp
cleaning system" ( page 430).
276