I use Valvoline Pyroil Gas Dryer from an Advance Auto Parts store. $1.99 a bottle, and it is 100% isopropyl alcohol. It has a bittering agent added, which I assume is to keep alkies from drinking it, no residue I can see on a shiny smooth metal surface after it dries.
And I went to a camera store and got some lens cleaning tissues, they are lint free.
from the Material Safety Data Sheet at Valvoline:
2. COMPOSITION/INFORMATION ON INGREDIENTS
Ingredient(s) CAS Number % (by weight)
-------------------------------------------- ------------- -------------
ISOPROPANOL 67-63-0 90.0-100.0