Skoda Octavia COMBI 2007 Owner's Manual page 223

222 Inspecting and Replenishing
Caution
•
On no account should you add radiator antifreeze or other additives to the
windscreen washer fluid.
•
If the vehicle is fitted with 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 your Škoda Service Partner, who will
tell you which cleaning agent you can use.