Every time you clean your guinea pig's cage, you need a place to keep them, you could keep them in your lap,(which I don't recommend) or you can make a pen for them to play in (also you can buy a tube, where they can play and hide in. My guinea pigs love it!!!!!!!!!!!=]). Let me tell you something, when you clean your guinea pig's cages, it's a BIG mess, so you will need to have a garbage bag, and if you could wear gloves. You, as the person who cleans the cages, has to know something, you have to have the cage like a skyscraper,but also like the leaning tower of pisa. The cage roof needs to be off (so it's just the bottom of the cage) , then you put it the skyscraper way, then put the garbage bag under the ends, then you want to lift it up (not all the way but like I said like the leaning tower of pisa), if you have gloves then you can scrape the bedding off with your hands (well, with the gloves), and after you are done, tie the garbage bag up and throw it away.