I didnt clean it in two years (shameonme) and when i went to look into the blades the drum fan was completely coated in white mycelium and grey molds....the real funny part was that when i went to remove it with a brush , the smell that came out was very delicious healthy mushroom smell!!! like fresh oysters!!!
Anyway...after brushing, i washed the coils with a solution of half bleach and half water....i was told is a good substitute for the cleaning sprays....it will clean also the water recollection tray and the drain hose......unbelievable the gunk that came out.
For household use, the dust filter should be cleaned every week, but i noticed that ina sealed room its different, is not even near to the amount of dust that is generated in a space where people live...my dust filters were always pretty clean....the problem seems the molds in the blower drum fan that needs attention...
Im looking to run an air purifier in the room to keep the sporeload in check!