Whenever we do a factory reset with either TWRP or CMW recovery to change from one ROM to another, does that action delete EVERYTHING from the previous ROM, or are there some residue files left?
Every now and then, whenever I see that my device feels slow or having lots of small issues, I flash the stock Google factory image, which deletes pretty much everything extra, and start again from there.
Do any of you do this aswell once in a while? Or is it useless?
Any other tips to help my little bit of OCD regarding a clean file library?