Oh a few more ideas. I use diluted bleach for cleanings, every few months because my froglets were taken in from the wild(my yard and pool) and may still have some parasites. Just a cap full or two per 1 gal of water.(this is also the way to detox your fruits and veggies!LOL so it's fairly safe if done correctly) Just make sure you rinse down everything well and don't use it on anything that's porous. The smell seems not to linger as badly as vinager or possibly using to much vinager in the water. I don't think you really need to do to much sterilizing that often unless there is a problem, so just frog safe water is fine for regular cleanings, but I think Jo-Anna covered this!LOL Anyway mine change colored more than I change undiesLOL and seem to show their best colors when they are eating, not to worry unless they stay real dark or real pale for a long period of time, which may indicate a illness or other problem.
I also get lil fuzzy pooplets around the tank too, not to worry there too, like Jo-anna said with all the humidity and misting mold is unavoidable. I just scoop it out as needed until I clean the entire tank. BTW you can also use diluted bleach on living plants (very diluted and rinse with water only when you really need to, like for illnesses, etc.) and also can bake the log to disinfect if need be, as long as it is real wood, there are directions for that on this site if you need to in the future(again if there is an illness or infestation of some sort.
I have a mesh lid on my 10 gal too and I am using plexiglass on half the top. I don't know what's availible where you are , but I got mine at Home Depot. They will cut the plexiglass down to the sizes you want. (My male bunnies spray, when they are teenagers, so I got big sheets of it cut down and covered the sides of their cages to prevent it from getting all over the place. I am using the scrap peices to cover the frogs and it's helping to keep the humidity much more stable than without it.) Hope this additional info helps, but I think Jo-anna covered everything pretty well