Skoda SUPERB - 05-2010 Owner's Manual page 228

Caution

On no account should you add radiator antifreeze or other additives to the wind-
screen washer fluid.

If the vehicle is fitted with a headlight cleaning system, you should only add
cleaning products which do not attack the polycarbonate coating of the headlights to
the windscreen washer fluid. Please contact an authorised Škoda Service Partner, who
will tell you which cleaning agent you can use.
Using the system Safety Driving Tips General Maintenance
Inspecting and replenishing
Breakdown assistance Technical Data
227