what do you wash your underwear with?

I use arm and hammer detergent the smell is ocean burst. I’m thinking I need to switch to something very light or barely had a smell when I wash my underwear. im trying to be careful with my lady bits because bv is very prone with me and I hate it.. im thinking my detergent or either the soap I use when I bathe is the culprit. I use dove bar soaps maybe I should switch to the unscented kind? I don’t wash inside though only the outside so i’m not sure if soap is still getting in somehow but I need to figure this thing out!! help me ladies please lol