Reset variables in an same screen

I need find out if there any way  of do any reset of all screen..  something like as when exits and reenter the App that reset everything the variables  but obviously without doing this because not  it would be logical. In briefly I need  clarear all the variables without leaving of all the screen. I tryed delete placing an text empty to each varible, but apparently does not work because when I tryed save any data with TinyDB I not overwrite the new datas to save. Any idea.?

Annex a picture of the that I did.

to reset everything in TinyDB, just use the TinyDB.ClearAll block

http://ai2.appinventor.mit.edu/reference/components/storage.html#TinyDB

ClearAll()

Clear the entire data store