Dryer vents with a mesh grate can become clogged with lint, but dryer lints without a grate invite critters in. This simple ...

reinstall the vent cover and pick up any lint that's fallen onto the ground (or roof!). Your dryer vent should be cleaned ...

You can also easily get at the exit point outside the house by removing its duct flap or duct cover. Next you need to buy a specialized dryer vent cleaning kit. I picked this one up at my local ...