OMG, I just read this tip in a book yesterday and thought it was pretty ingeneous, but never thought I would actually have the chance to share it with anyone! I never thought anyone would ask for advice on this topic!
Take a towel and get it pretty damp, not dripping wet, but very damp. Then hang it on the back of the fan. Then take your blow dryer on the highest setting and blow the dirt off the blades, it should blow back and the dust should stick to the damp cloth! I'm sure you would probably have to do this on both sides!
I haven't tried it yet, but I will when I get my box fans out in a few weeks. If you try it, you'll have to let me know if it works. (It also is suppose to work on older upright heated water radiators)!
Hope it works for you!
Take a towel and get it pretty damp, not dripping wet, but very damp. Then hang it on the back of the fan. Then take your blow dryer on the highest setting and blow the dirt off the blades, it should blow back and the dust should stick to the damp cloth! I'm sure you would probably have to do this on both sides!
I haven't tried it yet, but I will when I get my box fans out in a few weeks. If you try it, you'll have to let me know if it works. (It also is suppose to work on older upright heated water radiators)!
Hope it works for you!