I do clean rifle, mags and pistol after each game...
And the bottles will be rinsed out too.
If I'm using very modified pistol and aeg which I've spend fortunes on I'm going to make sure everything is just so.
As for washing... Get a bucket throw your balls in, I use pure soap flakes as it doesn't leave any residue at all give them a good rattle about, then rinse off a few times to get anything off them that's left then (ask the gf/wife to help😆)pour in to your wife's/ mums siv or couldiner rinse again, put them in a clean bowl, dry your bucket out put them back in and use a none fluffy towel to dry them, them I leave them in the conservatory to dry off for a day, nice smooth clean balls ready for action!