How to project clean in Android Studio?

You can clean your project doing this

Build > Clean Project or Build > Rebuild Project

Also you can do the gradlew clean

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As @Kellogs commented :

Manually delete the [project]/.gradle as hidden folder as that one is the main culprit for large cleaned projects sizes.

Cleaning an android project is quite simple just follow these steps

1. Click on Gradle pane,found in the top-right corner of Android Studio 
2. Click on your project,then Tasks -> build ->clean

Step 1

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Step 2

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Note Never clean your project using the Build -> Clean Project.Instead of cleaning your project it will increase the size of it.

Update clean has been replaced by cleanBuildCache in the recent versions of Android Studio.

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