Lat year I bought a used portable A/C unit but realised when I got it home that it had been used in a building environment and had taken in a lot of concrete dust. I opened the unit up and cleaned a lot of the conrete dust from anywhere I could access, but it is very difficult to remove it from the fan blades. Hence when I used the unit after cleaning it continued to generate a smell and when I opened it again this year I found there was a fine layer of dust on the inside of the plastic unit - although not half as bad as it was the last time.
Anyway, I have attached a couple of photos. On one side I can get good access to the fan, but on the other the motor is in the way which gives me a tiny amount of access - maybe an inch on either side of the motor.
Does anyone know what would most effectively clean this off the fan blades?
I have seen recommendation for isopropyl alcohol 99%, but there are also specialised concrete cleaning fluids that claim to dissolve concrete like "belle clean". I have the added joy that I don't want to use any acid that might harm the fan, and I need to make sure I don't damage the motor or the shaft that is goes through one side of the fan and is bolted to the other side in the photo.
Also, if anyone knows what kind of cleaning brush works well that would help. Are the flexible radiator brushes any good?
Anyway, I have attached a couple of photos. On one side I can get good access to the fan, but on the other the motor is in the way which gives me a tiny amount of access - maybe an inch on either side of the motor.
Does anyone know what would most effectively clean this off the fan blades?
I have seen recommendation for isopropyl alcohol 99%, but there are also specialised concrete cleaning fluids that claim to dissolve concrete like "belle clean". I have the added joy that I don't want to use any acid that might harm the fan, and I need to make sure I don't damage the motor or the shaft that is goes through one side of the fan and is bolted to the other side in the photo.
Also, if anyone knows what kind of cleaning brush works well that would help. Are the flexible radiator brushes any good?
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