What is safe to use to clean it? Besides just like paper towel. Thanks in advance for any help.
You can use any cleaner as long as you rinse it off the surfaces completely.
Many keepers use bleach at about a 1 part bleach to 10 parts water.
If you want to pay more, you can purchase products specifically formulated to clean reptile cages.
You can steam clean also with the mini hand held steam cleaners.
It all depends on how much money you want to spend, and how particular you are...