Description
This extension makes it possible to easily delete all the demo data at once before going into production. The available options are all the data pieces included in the opencart clean installation. I will consider adding support for any other data/files that you may want to remove.

Components:
Categories
Products
Products Images
Recurring Profiles
Filters
Attributes
Attribute Groups
Options
Manufacturers
Coupons
TT Blogs(TT Blog module)

Compatibility
Any opencart version newer than 3.0.0

Installation
Method 1 - Extension Installer
Go to Admin Panel -> Extensions -> Installer
Upload the zip file version of the extension

Method 2 - Manual Installation
Clone the repository or unzip the archive file
Move the following files from the upload folder to your project folder:

upload/admin/controller/extension/module/remove_demo_data.php ->
your-project/admin/controller/extension/module

upload/admin/language/en-gb/extension/module/remove_demo_data.php ->
your-project/admin/language/en-gb/extension/module

upload/admin/view/stylesheet/remove_demo_data.css ->
your-project/admin/view/stylesheet

upload/admin/view/template/extension/module/remove_demo_data ->
your-project/admin/view/template/extension/modul

Usage
Find the extension: Admin panel -> extensions -> extensions -> modules(choose from the dropdown list) -> Remove demo data module
If the extension has an install button and is not enabled, hit install
To use it, hit the edit button
On the Remove demo data page, you can see two columns, the first one is for database data and the second one is for files.
Check whichever components you want to delete the data from and/or the files and submit via the "Remove data" button at the bottom
That's all, your selected data has been deleted.

Attention
Although this was created to delete all the demo data a fresh installation/development version of the opencart might have, please understand that it deletes all the data from the selected components, therefore, if you check categories, it will delete all categories, if you check products, it will remove all products and so on.