My Chausson which I bought is 7 tears old and they never went very far except for the summer holiday to France,, He worked for P&O so got a free trip every year. These were taken in the summer so they never used the van heater. When I got it I have used it more in the few months than they did in a year, but It is a bit chilly now so the heater was put on and the smell of hot dust is quite pronounced and unpleasant. I have tried putting my airline down the vents and putting the blower on full power when I am not in it, even vacuuming with my industrial cleaner but the smell persists. I suppose it will go but I do not like it at all ( It stinks and I sneeze) Does anyone have a good idea to get the 7 years worth of accumulated dust and dirt out of it WITHOUT taking the dash and heater unit out. It is probably on the actual heater matrix buried depp in the unit.