I have one of those bottle brushes and the special disinfectant, fine for the wire mesh peanut / fatball holders but with the plastic sided ones (seeds, mealworms, niger seeds no matter what I do there are always seeds wedged in the crevices that eventually go mouldy. I am tempted to just chuck them away and buy new but cheap ones don't survive magpies and the like and it’s not eco friendly. What do you do?