Is that going to do much considering I've removed temp file Windows.~BT etc and Windows.old plus I never kept anything during install other than Steam Libraries on other drives. Probably still do it though, just through minor OCD but anyone reading might wonder if there is a valid reason other than the OCUK forum is more like OCDUK
I always prefer to do a clean install so I am using the W10 drivers and nothing left behind from W7 but that's just me. if your happy with it then keep it as it is