My pigs have recently had a fleece area added to their cage. It’s a 5ft x 5ft cage and now about half of it is fleece and half is still finacard with hay on top. They look so much happier to have that fleece area! I have put their hideys on the fleece area and I often find them snuggled up in their hideys. they seem to play in the hay area and rest and eat their veg on the fleece now.
Hay sticks to it but a brush down and a shake in the garden and it is usually fine.
Because it goes through the washing machine, I do need to keep disinfecting my machine but that is easy enough.
It is much easier to pick up poops though. I just brush them into a dustpan. When on hay, it just falls through and some gets missed until I do the weekly full cage clean. so I feel the cage is cleaner for longer with fleece.
I change it every few days. My pigs aren’t litter trained.