my experience: totally satisfied of the fleece.
I use simple pieces of fleece used as a bedlinen; underneath I put old newspapers/leaflets from supermarket. Under the newspapers, only for having a thicker floor, I have put old cotton towels (which have been there for months, never washed because they are clean).
Once a day I remove the fleece, shake it on the floor with all the poos and leftovers; I hang out the fleece for some cool air, replace the few wet papers with new ones and then I cover the floor again with the same fleece. In the meanwhile my piggies have their floor time.
I wash my fleece maybe once a week, sometimes more often only for changing the colour of the cage or because I have the washing machine ready for a laundry... (I wash the fleece with my laundry).
The cost is zero and the piggies' feet and hair are clean.
Anyway, you can use puppy pads under the fleece; some owners sew the fleece with the absorbent layers, a lovely result, but I am not able to sew...
This is how my cage looks like:
this is when I shake the fleece on the floor
the cage is in my living room and there is no smell at all. Totally satisfied!