I've skipped over the last few posts but saw something that got my attention.
Almost all online tutorials say to use ammonia free windex. Mine is an organic off brand glass cleaner that is 100% safe. I've also never had ANY buildup or drawback to using it.
For people looking for a cheap air supply with tank:
http://www.harborfreight.com/air-tools/oilless-compressors/1-3-hp-3-gallon-100-psi-oilless-air-compressor-97080.html
the regulators work just fine on these, all you need to add is a water trap. If it's coming from an air tank, the compressor itself is of little importance aside from noise and perhaps how fast it fills. Neither of those factors are issues for me.
I also like these as they have 2 gauges: 1 for the current tank pressure, and one for your output. This lets you know when your tank is full, and also watch your output volume.