Mercedes-Benz C-Class Coupe 2019 Operator's Manual page 349

To avoid damage to your vehicle, observe the fol‐
lowing when using a power washer:
keep the SmartKey at least 10 ft (3 m) away
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from the vehicle. Otherwise the trunk lid
could open unintentionally.
maintain a distance of at least 11.8 in
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(30 cm) to the vehicle.
vehicles with decorative foil: parts of your
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vehicle are covered with a decorative foil.
Maintain a distance of at least 27.6 in
(70 cm) between the foil-covered parts of the
vehicle and the nozzle of the power washer.
Move the power washer nozzle around whilst
cleaning. The water temperature of the
power washer must not exceed 140 °F
(60 °C).
observe the information on the correct dis‐
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tance in the equipment manufacturer's oper‐
ating instructions.
do not point the nozzle of the power washer
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directly at sensitive parts such as tires, slits,
electrical components, batteries, light bulbs
and ventilation slots.
Washing the vehicle by hand
Observe the legal requirements, e.g. in a number
of countries, washing by hand is only permitted
in specially designated wash bays.
Maintenance and care 347
Use a mild cleaning agent, e.g. car shampoo.
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Wash the vehicle with lukewarm water using
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a soft car sponge. When doing so, do not
expose the vehicle to direct sunlight.
Carefully hose the vehicle off with water and
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dry using a chamois. Take care not to point
the water jet directly towards the air inlet
grille.