Somebody once told me that when you put a few drops, of cleareyes, like two or three in somebodies drink it will take like two days of somebodies memory.

I know for a fact that that is not true. I have heard from various people and movies when I was younger that it can give you the runs very badly. I am not sure if this is true but I would never recommend doing it to yourself or anyone else in case it can have a much harsher effect.

No of course that is not true. Someone is lying to you. And not even a good lie.