Gradle cache is located at
- On Windows:
%USERPROFILE%\.gradle\caches
- On Mac / UNIX:
~/.gradle/caches/
You can browse to these directory and manually delete it or run
rm -r $HOME/.gradle/caches/
on UNIX system. Run this command will also force to download dependencies.
UPDATE
Clear the Android build cache of current project
NOTE: Android Studio’s File > Invalidate Caches / Restart
doesn’t clear the Android build cache, so you’ll have to clean it separately.
On Windows:
gradlew cleanBuildCache
On Mac or UNIX:
./gradlew cleanBuildCache
UPDATE 2
This article Put your Android Studio on a diet gives more details on Android Studio caches