And for the cleansing of the house he shall take two small birds, with cedarwood and scarlet yarn and hyssop...
Leviticus 14:49 ESV

The two birds for cleansing a leprous house aren't described as clean, but since their purpose is to cleanse the house, that should probably be assumed, especially since it is explicitly stated so in the case of cleansing a leprous person earlier in the chapter.