Deleting Products used in Quotes/Sales Orders Problem

Deleting Products used in Quotes/Sales Orders Problem

Hi everyone,

So we want to delete 75 products and replace them with products from another vendor and different product code. 

When trying to delete, I get the following warning:

Sorry, you cannot delete the product(s).

The product(s) cannot be deleted because they are involved in the inventory modules (Quotes/Sales Order/Purchase Order/Invoice).

technically, this shouldn't be an issue considering that the CRM doesn't update products in those modules anyway ( when there is a price or description change, the products in the quote/order are not updated - so they are obviously not linked once added to the product details)
BUT if it's not technically possible to keep the old products in those modules and still delete them, then at least give us a linked list of the  Quotes/Sales Orders/Purchase Orders/Invoices in question! - as you do when deleting fields in those modules - so that we can go and delete them. What am I supposed to do now? Go and check each one by one and see if said products are included or not? That would take me weeks if not months...
I need a way to fix this issue ASAP.
Please assist with ideas and solutions. 

Best Regards,
Damon