you only need to do spot checks whenever needed, just scooping out poop or picking out skin
a proper clean out, i normally do this once every 3 - 6 months, it just isnt needed anymore, unless you have had a case of mites, ticks, RI's or anything like that, then yes by all means fully and properly clean it out.
anything more than that can really stress them out, they love their surroundings once they get settled in, they know it, and if you clean them out way to often than needed its gonna be new surroundings to your little one all the time and that would continuously freak him/her out. snakes are very clean animals, it just isnt neccessary personally.
just my opinions.