Yep, I do that. Just ran them through the laundry on Sunday!I don't have a traditional "roost" bar, I have the Omlet system, a Cube MK2, so it's a square platform with roost bars built-in, see if I can find a product picture...
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But yes, like @micstrachan (?) does with her towels, if I had a single roost bar, I would lay it lengthwise on the roost, and cover it with a towel, and wrap it around with light bungee cords.