Our local cat and dog shelter doesn’t accept duvets at all - difficult to launder, but other bedding and towels are welcome.
My regretted purchase was a sofa - it looked (mainly) pink in the shop, it said it was pink, but when it arrived it was a godawful peach. As it was for a little used room, we put up with it for a few years, then as we were about to redecorate, DH said to just get rid. It still had the fire safety label attached, but we struggled to find any charity to take it - apparently customers preferred leather!! I think the PDSA took it, eventually.