icloud storage show 20G of messages

Ok, I deleted nearly all the message threads from both my mac and iphone, waited a few days and indeed the icloud messages storage has dropped from 20G to 10G. But 10G still doesn't seem right for a handful of messages. I can't find a way via icloud to look at what is stored there. I can see individual photos, but not messages. Is there a way to see individual messages in icloud?

Oh! Thanks. Maybe I ask you a follow up? I have an old ipad I haven't used in years but never wiped. Could messages on that be contributing? I read where you have to delete from both the iphone and the mac to get rid of them and I did that on what I use daily but never thought to dig out old devices.