To be able to delete Google Play updates, please do the following:

1. Tap Settings > Apps;
2. Ensure it says All Apps at the top. If not, Tap the drop-down menu and select All Apps;
3. Tap Google Play Store > Menu and then the 3-vertical-dot button on the top right corner;
4. Tap Uninstall Updates > OK. The only data being removed is the updates to Google Play Store.