My laundry room is on the second floor so it's hard to always be able to clean the vent. The cover on the vent right now isn't doing the job. The lint is getting stuck in it and not flowing through easily. I want to replace it with the "flapping cover" but I'm worried about birds getting into my dryer vent and making a nest. Any suggestions on a good dryer vent cover that won't clog easy and won't allow birds in ? Thanks.