I don't think cleaning the cache does much these days. The OS fills it up with the latest from it's own cache. That's why the number goes back up very quickly.
I was just telling nostr:npub1de6l09erjl9r990q7n9ql0rwh8x8n059ht7a267n0q3qe28wua8q20q0sd and the viewers on his chat that I have just cleaned around 3 Gigabyte of cache on my smartphone. And for a stream while on carrier connection it took over 1 Gigabyte of data in a few minutes.
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Sad! Got to get an extra SSD to plug in on the mini USB.