Sloshing after A/C use

[LedRobster]

Does anyone else get sloshing noises after extended A\C use? I didn't really notice before since I usually drive with the windows down, but after a few highway trips with the wife over the hot weekend with the A\C on when pulling down my alley and driveway at slow speeds I can hear sloshing from the front of the car. Does my A\C drain need cleared? Where is it?

Thanks!