Help on deleting residual files(?)

Hi, I am new to installing custom rom and just completed installing one. I have wiped the cache, system, data using twrp after flashing the ROM. After installation, I did a factory reset as well. I have noticed that there are residual files (files from previous rom, downloaded files, rom and firmware files). How do i go about cleaning them up? I assumed that all of it would be deleted after wiping and factory reset

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