avoids some of the records while running

As you delete rows, the row count changes... and the index of each row changes.  So, let's say you have a date row at row 5 and another one at row 6.  So, you find the one at row 5... you delete it... now the one at row 6 is now row 5.  but you've already iterated through row 5 so whatever is in row 5 now gets skipped.  So, you are dealing with a grid that is changing length as you are looping through it.

You will probably also get another error where you may try to access a row that no longer exists when you get to the end.

So... instead of a for loop...you're going to need to do something entirely different.  You're going to need to do (again, pseudo-code) something like:

var foundRow = Grid.FindRow('Created Date') //I think this code you already know how to use.

while (foundRow != -1) { //Assuming foundRow returns -1 if it doesn't find something
    //Do your stuff where you click the cell, delete, etc.
    //repeat the findRow
    foundRow = Grid.FindRow('Created Date') 
}