formToKeep: For example, if formToKeep is "purchase", then submissions["purchase"] will not be cleared, but the rest will. If formsToKeep is null or empty string, then all will be cleared.
See Implementation
formToKeep: For example, if formToKeep is "purchase", then submissions["purchase"] will not be cleared, but the rest will. If formsToKeep is null or empty string, then all will be cleared.