Microsoft releases a tool to clean Install windows 10 easily

Microsoft has officially released a new tool for Windows Insiders allowing for the clean installation of Windows 10. It was informed earlier by Microsoft not too long ago and starting with Build 14342 it is usable.
To use this tool,you need to be on the Windows Insider preview version,MS says 14342 and later can be used.This tool would install a clean copy of  the Windows insider preview.The tool first downloads the ISO from the servers and then does a clean Install.However,as MS doesn’t provide fast ring ISO’s,the builds might be older:

The build installed by this tool is not guaranteed to be the latest build available to Insiders, and at times may install a Windows 10 build that is older that you had previously.

Only 3 languages are supported as of now,English,Japanese and Chinese.Also there is no guarantees that it would transfer digital licenses.

During this preview period, we cannot guarantee your digital licenses, digital content associated with applications, or other digital entitlements for applications will be carried through after using the tool, which may impact your ability to use paid-for apps or apps-related content.  For this reason, we don’t recommend installing the preview on any PC where you wish to ensure all of your applications and application-related content (including Microsoft applications such as Office) remain properly installed and licensed. 

Download the tool:

Download tool now

After a clean Install,everything is erased.So backup your files before doing it.
Head over to this link for more information:
Now Available: Start fresh with a clean install of Windows 10!