How to reinstall Android on Polaroid PSPT350
You don't need to reinstall Android in order to "clean" your device.
You just have to go to settings>Back up and reset>Factory reset the device (the names may vary from device to device) but are like this.
So when you do this, what really happens is that the device is restored to a new device (just as you bought).

Take in mind that all your data will be erased, so back up your data first.