Do you use diaper inserts along with the diapers? I prefer laying the insert over the diaper rather than slotting it into the pocket. So far I find that these kind of inserts are the easiest for washing off poo stains: https://shopee.sg/product/38160011/583941499?smtt=0.0.9. For extra insurance, Tollyjoy's flushable liners are one of the thicker ones I have come across.
Adel