Android works differently than Windows and other platforms. It actually tries to fill up the RAM as much as it can and only free up RAM when needed. This is why you clear it but see it piled right back up. It actually causes more battery drain and such to keep clearing RAM since the processor will keep working to refill it.
One strong point on Android is actually its RAM management. You can pretty much forget about it and it will handle it as needed. It is still okay to clear your "recent apps" if you want but I wouldn't clear the RAM. I clear my "recent apps" screen just because I don't want to have 50 things in there and have to scroll through to find what I want haha

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