Hey all! Just looking for some advice from some more experienced herp keepers than myself. Have a juvenile Desert Woma BP (about 6 months old) in a 20L aquarium for now. Aspen substrate. She typically poops every 7-10 days, which i remove immediately with the substrate it was lying on. I have read BP's pass both liquid and solid forms of urine, which I have seen the solids. Cant see or find (or smell) any of the liquid variety in her enclosure. That being said, how often should I replace ALL the substrate with fresh versus just spot cleaning? Also, what cleaning products does everyone recommend to thoroughly sterilize everything without possibly hurting the snake? Is a very mild bleach solution OK, since it would prob be the cheapest and can be easily made at home?

As a side note, I also have a Columbian Red Tail currently on reptile carpet. Its worked very well for me so far but have seen posts that say I really shouldnt use it. If I do continue to use it, what is the recommended cleaning procedure and frequency? Thanks for any help you can give!