I used boiling water to clean my dragon's tank when he had coccidia, as I have read in more than one place that bleach will not kill coccidia. The boiling water did the trick.
As my vet explained, you should keep them on paper towels with nothing in the tank. If you have decorations and things in the tank, when the dragon poops if he has any left on him or he steps on it or anything, he's tracking coccidia around the tank, so just cleaning the spot where he pooped isn't good enough because he could have carried it over onto some decoration and now it's hiding somewhere you'd least expect it, multiplying and waiting for your dragon to step on that spot again.
So. This is why I kept my dragon on only paper towels with nothing but his salad bowl in his cage. I cleaned that daily as well.
When the dragon poops, immediately clean it up. Take out ALL the paper towels and throw them away, clean the bottom of the tank with bleach solution or boiling water/steam, put in entirely new paper towels. My dragon had coccidia for weeks longer than he should have because I thought I was doing a "good enough" job cleaning. I had his food dish and a "tub" of water for him to soak in since the meds would dehydrate him, and that just made things worse. You have to be really tough about it or it won't improve.