Window condensation

Has the window got any little plugs that can be removed then the warm air may clear it fr

Yes they do have plugs I have removed but not clearing 

What about using a hairdryer directed gently through the hole?

Occasionally, we get slight condensation in our big front windows and I was advised by the dealer, just to leave it and it will clear.  Taking the plugs out can allow little insects to get in and that can make matters worse. They do usually clear within half an hour of having hot sunlight on them but I must admit the condensation is nowhere near as bad as yours appear to be. They aren't sealed units in the same way that domestic ones are, so some condensation can occur from time to time.

We had persistant condensation in our front window, which remained despite the two small plugs being removed. We finally drilled a 3mm hole in at the window’s lowest point, out of site, on the edge. Water drained out at first, then the condensation disappeared over about 10 days. There’s been no insect invasion or reoccurrence of condensation.

Like the soft plastic kitchen jugs which stain so easily - The plexiglass material is not completely waterproof therefore a small amount of moisture can get in, depending upon season. The tiny amount will evaporate out, given time and good weather, however....

If it is more than a tiny amount, in conditions when there are no insects about, you can remove both plugs and find something to blow air into one hole. A 12v computer cooling fan, running from the caravan's battery, left for a day will do this.

The OP's photo suggest the two panels have become delaminated and are leaking. If that is the case, best remove it, thoroughly dry it out, then reseal the edge with some proper solvent. I have several times mentioned a company which can supply this special solvent, in various caravan groups.