I am working on a task that requires a separate workbooks. In my second workbook there is an extra 100+ rows that I keep deleting and they are reappearing. I have tried to choose CTRL+End and the pressed clear formatting all for the rows, but then they come back again.
Do I understand correctly you have empty rows all the time at the bottom of you range? To clean, select all these empty rows (from end of the range till the roe where Ctrl+End is positioned), Home->Clear-Clear All. Save and reopen workbook. As a rule Ctrl+End shall be at the end of your range after that.
Select the row immediately below your data and press Ctrl+Shift+End to select all blank rows below your data. Press Ctrl+- and select Rows, then click Ok to delete all the selected rows. Save your file. If you now press Ctrl+End, you will jump to the rightmost cell in the last row of your data, which indicates that you successfully deleted all blank rows below it.
@Twifoo , Ctrl+Shift+End selects all rows till end of the worksheet (1M something), not till Ctrl+End. If I understood correctly that's not empty rows between two ranges, these are not cleaned rows below the range,