Delete all products

first go to the products list. Then under "product search" in the top left you change results at a time from 100 items to All. Then click search products.
This will be the full list of your products. Then under "products batch operations" click the "check all" button to select everything for deletion (make sure you actually want to do this!)
Then from the dropdown select "Delete products" then click "run products batch" to delete all the selected products.

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