So I've been combating this for a while, and I go through problem free stretches followed by annoyingly problem filled time. My birds keep dirty nests. At times I could clean them once a month and they'd never get an egg dirty, but then there's times I could clean them every single day and my eggs would come out caked. Any hints on what I'm doing wrong? The nests are on the ground right now (have been since I brought them home, mind you) and have no outer roost spots they can set in. They soil them while in the nests. Thanks for any advice!