Cm cleaner is just not needed on modern phones. What it does is placebo and may hamper performance. As for ES Explorer, if you don't care about privacy - then no, it will not harm your phone or files. But if you care, it tracks your behaviour and uploads to Chinese server. It's all bloated and spammy now anyway. And like cm cleaner, it now offers deceiving and utterly useless features. You can search about that, you will see a whole suite of reasons why ES is now bullshit. There are lots of better alternatives out there (like just pick one among Mixplorer, Solid Explorer and FX Explorer), so there's really no reason to stick to ES.