When our Silkie Mini was kept inhouse for her many health issues she wore a chicken diaper. But if she had a cecal poop it smeared in the diaper onto her butt fluff. We baby shampoo'd only the butt feathers in the bathroom sink & blow-dried on low warm. Chickens seem to like blow-drying when they're wet. We don't blow-dry super cold rain-drenched Silkies, just paper towel dry them.
We never trimmed butt feathers unless there was a super hard crusty poop on a feather then we cut the poop off. We never cut close to skin.
MINI in her diaper which I made to custom fit made from scrap fabric & saved myself $25 from purchasing online!
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MINI escaped the house running in her diaper!
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