Sometimes when they're younger they'll kind of ignore their poop and sit in it but they tend to avoid it when they get older. I agree that it's best to remove it as soon as you see it and if they're laying in it, they should get a bath and maybe a quick spray down with some Vetericyn to prevent spread of bacteria.
yeah it must be because they are just a year old then, because, he would be basking, poop while basking then continue to just lay in it..... i do clean the poop out when i see it, and i do give him a bath after he does this.