I just bought a cheap cordless hand vacuum from Amazon. It works really well, especially to get those tiny pieces of hay off the fleece. The only downsides are that I still of course have to pick up the very large pieces of old hay and I always have to take the piggies out when I vacuum. I've seen many people vacuum while their piggies are still in the cage so I tried it myself once, but they seemed very scared so now I always take them out. Wasn't really a surprise though, not sure how so many people's guinea pigs were so chill about it lol. I would recommend my vacuum, but I bought it on German Amazon so I'm not sure it'd be much help. It was just a random brand, but I looked at the reviews to make sure it would be able to suck and hold in the poos.