I have brought in all my birdhouses and plan to clean and repair them all. Many of them were obviously made to be used indoors, as all the paint has peeled off. I would like to repaint some or perhaps stain them. Does anyone know what paints/stains I should avoid and what ones are safe for birds. I would not do anything to the inside other than clean them out, this would just be on the outside. Thanks for any insight.