We have posted hundreds of threads on this subject and I particularly have spent dozens of hours of my life posting on this topic on this subject and I'm not the only one. Many of us have given the most awesome advice on the subject and most of us are simply avoiding answering the same basic questions. It's becoming tiresome to have to repeat the same things to people who are not willing to do the research I'm afraid. If you want to really get good answers, you need to do a forum search on fleece and spend some time weeding through the threads.
I think we need get the "Fleece Project" thread updated with a more specific description of what you do to maintain the fleece so that we can refer to to that thread at least.
Fleece bedding systems are a very labor intensive bedding. You cannot let it go without suckin' or sweepin' up poo at LEAST once but preferrably twice a day depending on your cage size and amount of pigs. You cannot just drop a piece of fleece into the cage and consider that 'fleece bedding'. Using fleece takes a lot of research as well as some trial and error if you want to, or in my case HAVE to make it work properly.
Even the most sophisticated fleece bedding system cannot go more than a week on average, and that is WITH a huge Cube and Coroplast habitat, very few pigs and with twice daily poo sweeping. I can stretch mine out to 10 days on occassion but that's it and my system has been very finely tested and tuned to get it to that point.
Be careful when choosing to use a fleece bedding system.. If one does not have the time or inclination to set-up a fleece bedding system or to do the work to maintain it one is be better off switching to aspen or carefresh. I'm afraid to admit it sometimes, but fleece isn't for everyone. It's got to fit into your situation for it to work for you.
Improperly maintained fleece can be a huge health problem for guinea pigs, and can encourage feet fungus (bumblefoot) and other problems because sitting on wet blankets is not healthy. Neither is sitting in piles of poo. In addition the odor your pigs get if you don't maintain it can be overwhelming for the strongest of noses..