Is there a way to automatically reset the value of all cells in a spreasheet
that have been shaded a specific colour?

In my spreadsheet I have (for ease of use) shaded yellow all the cells that
the user can input data into. Anything not shaded yellow is protected and
unavailable to the user. What i want to do is clear all the user inputs at
the end of each month, so that at the start of the following month they can
re-use the spreadsheet.

Can this be done? i could not find anything in VBA, but there must be
something.

Any help is appreciated!