Clogged air vents

My 94 prizm sat for about 8 months before I started using it again. Before the air blew very strong when i turned them on. Now it seems from leaving it, it has collected dirt/leaves inside the vents. Not sure exactly if that's true or possible but here's the symptoms. Not much air comes out from the interior vents when put on highest setting, not like previously where it blew very strong. And it seems now that the motor is having a hard time blowing air through the vents because it's making a *vrrrrrrmmmmm* vibrating noise. Also, when I put the setting into vent(instead of circulate) I dno't get as much air going through the cab at highway speeds. Before I would leave it on vent on highway driving because it blew stronger than having the fan on.

Thank yoU!!!

anyone? any tips? Should I check the blower? Should i take off that shroud infront of the windshield and see?