Refer to second sentence. My bags never get dirty. Just air them out when you're home and all good. They need washing now and again anyway to prolong down.
Do you not ever get into bags with legs covered in grime? I do. So I use a liner.
Brush them off? But no not really. But you could carry merino longjohns, then they double up as around campfire trousers and sleep in.
I do have a sea to summit silk liner but never used it.
@hippy started
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Refer to second sentence.
My bags never get dirty. Just air them out when you're home and all good. They need washing now and again anyway to prolong down.