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The same way you would a k&n filter. I used a k&n cleaning and oiling kit. Some people use simple green to clean it, then oil it with air cleaner oil.
This is exactly what I did, and turned out great. I let the filter dry over night...and then once I added the Oil, I let that sit over night so it would set/absorb a bit and to make sure if there was excess oil it soak in the filter, and would not get on the MAF.