alive cheato can be cleaned of anything of much bother, fresh water and some drying alone is fairly good, if you want to take it to extreme even bleach will work dilluted and VERY carefully, then a soak in dechlore, and if you have some extra lights to toss over the tank they are in, it wont take much, and you will have a tank full of cheato.
however, when I was doing mandarins, i had the same problem my solution was a black container and a zillion of those plastic plants used in kiddy aquariums.