Air compressors aren't that commonly used to clean equipment, maybe something something to do with dirt flying around everywhere. Farmers will use a 185 cfm or so trailer compressor to blow off combines especially, but also other equipment that builds up chaff and dust, to prevent fires, reduce weed seeds carried between fields, or clean at the end of season to reduce corrosion or rodents.
The most common use for air is blowing out radiators, and any size tank will work for that, just a little more waiting with smaller ones.