Basically enough water to cover the seed, add Vicron s or any other sterilisation liquid to the water, literally just a drop, soak for 24 hrs, drain and give to the birds
Took three years, but it looks like the light streak on Tacocat's tail feather might finally be gone. Either that, or he's been missing it for a few weeks. Each time he's moulted, it's become less obvious, so I do hope it's gone for good.