I have developed an excel/VBA workbook for processing and displaying
sensitive commercial information. I'd like to use the workbook for a
number of clients, but need to ensure that when I pass a 'clean' copy to a
client, he/she will not be able to recover information 'left over' from a
previous client's processing.

My question is: If I delete information from a worksheet, save under a
new name and then email the new version to someone, how do I ensure that
the deleted information cannot be recovered at a later date, either using
built in tools or specialist data recovery techniques/software?

Many thanks for your help.

Jell