Clean iPhone 5 front speaker grill without broken it?

Hi.
I have a iPhone 5 and after a couple of month of use after is been in my pockets i have get some dirt into the front grill on front of the speaker under the camera.

I have try to push my nail down there but im afraid any push on the grill will get it to loose from the frontglas?

Is this metal grill solid mount so maby i could use a new toothbrush to press it down and wipe it of? Or use compressed air? Just afraid to do somthing wrongvthat could get it to dissapair or loose.

Thanks for any advice