Re:Uh, like (Score 5, Informative)

Spray de-icer on it?

LOX has a boiling temperature of -183 degC, and the LOX line can be expected to be at approximately the same temperature. De-icer lowers the freezing temperature of water, but it doesn't lower it that much.

Wrap it in an insulator?

Any insulator would have to be flight-qualified with assurance that none could shed during ascent. If the insulation were to fall off, it could impact the shuttle and cause damage, or worse, allow ice formation.

Blow warm dry air over it?

This requires both a source of warm, dry air and the proper ducting to get it where it needs to be. This adds weight to the vehicle and has the potential to change the aerodynamics of the vehicle.

The end result is that low-tech solutions can (and often do) result in additional complexities for the vehicle. I mean, it's not like we're dealing with the most complex machine ever built or anything...