Yet more questions for the crowd as I get my kit ready.
Some of the drivers have a white substance on the cones (see photo). This raises a few questions.
1 - any idea what this is and if it is an issue?
2 - if it is purely cosmetic, any safe suggestions on cleaning? A wet cloth got another driver with this cleaner, but it still looks a little discolored. Also, the one in the photo is closer to the dust cap, and I am worried I will not be able to clean it effectively near the dust cap unless I use something thin with a solvent, but I fear a solvent will damage the cone.