I would not recommend rubbing alcohol ever. It can attack some of the chrome plastic finish and will attack the printed lettering/markings and can permantently discolor some of the plastics used by some manufacturers.

Windex is good but the technique I use to make mine look brand new every once in a while is to use the soft and new dedicated paint brush dry to lightly brush off only the loose grit then lightly spray the brushs bristles (not the tx) with lemon furniture wax spray (Pledge) by the way it contains silicon not waxes. Do not wipe it on the antenna, antennas should only be cleaned by alcohol.

The brush is lightly used to dampen the entire tx and the then it is buffed with a clean and dry towel. It will look new and no it will not harm the tx in any way, besides it smells better sort of like lemons.

John