Unhide all columns upon exit

We have an excel workbook, with several worksheets, that is shared by several team members. Members are very confused when they open the file and they don't see all the data. I need something that will unhide all hidden columns, so all data is available and showing each time the workbook is opened, on any worksheet/page. Does anyone have a macro to help me get this set up?

(PS--I also have a sample macro that will remove all filters upon exit. Those have been causing headaches too--a previous filter causes a new search to be "incorrect."