Help cleaning dust out of lg optimus g?

[khobbs]

Anyone know how I can clean this bad boy? I'm a welder so dust is imminent, but I don't want to bung up this phone right away. I cant take it apart due to the tork screws or whatever they are. And they don't make dust proof cases for these that I can find.
Its mostly getting into the speakers since theyre magnetic.
Any tips?

Thanks all

Edit I gently blow the speakers every few days with compressed air but I still imagine lots will get into the circuits etc.

 

[CapoKees]

Don `t blow with compressed air! You just blow it in the Phone,better is to use a vacuum cleaner at low power.

 

[CapoKees]

And when you use during your work put it in a small closed plastic bag to prevent it from dust.