It's not really recommended to run games from an external hard disk. These are SLOW, especially if USB 2. With USB 3 it's somewhat better. Better buy a bigger internal disk for the laptop?
- Anyway, what is that "it" that still uses 300 GB of space and what is "somewhere"? Can you tell where you looked and what you saw?
- What is the relation between that 220 GB and that 300 GB? What's the difference of 80 GB? That was already present somewhere?
- Sometimes, depending on the cleaning program, it saves what it found in hidden files and folders. Those still use space. Set your OS (Windows?) to show hidden and system files and have a new look at the disk.
If no luck at all, format that external disk and reinstall your games. Then make a backup on another external, so you can go back in the future without reinstalling. If you manage to fix it without format, such a backup might be a good idea also.
I had installed 220GB of games on my external HDD. Then after i turned my laptop off for a while and came back it said that there was some damaged files on on my HDD and it had to be cleaned up. So i let it clean up even though i was quite pissed that i had to reinstall all the games. when i looked at it afterwards i realized that the games were gone but it still used 300 GB of space somewhere but it doesnt seem to be on the HDD and my laptop doesnt even have that much space. Any help is appreciated.