Dust In Headlights

Hi all, was just wondering what is the best option for getting dust out of headlights. Wasnt there before so obviously since my wife and I have been away very dusty road. I presume the best way is remove lights from vehicle and flush out with water. Might need to get a bottle brush or some thing in there to loosen up if cooked on from the heat of the lights ?? Or will this scratch the reflector ?? Was your thoughts. Regards Steve M