Create a clear/reset "button"?

Geniuses-

I'm just finishing a project that is a collection of three calculators, each of which returns data based on a series of user-supplied variables. All the mechanics are working [thanks in part to replies to previous posts], but there is one more thing I'd like to add:

Does anyone have a way to clear the contents of another cell [actually several] cells via another cell? As the most complex calculator requires eight variables to be entered, I'd like to provide a quick way [a button?] to "clear" or "reset" the calculator - basically wipe all unlocked cells. I should note that all of the cells in question already have Data Validation of one type or another.

Any assistance will be generously rewarded with kind thoughts.
Thanks in advance,
joe in MPLS