I use wet wipes to clean. Use one hand to open up and area, and the other hand with the wipe to clean. I just go downwards in a swift motion (a few times), making sure there’s no poo/pee. Initally there was all the white stuff (vernix). That one... I cleaned over a few separate sessions, so my baby wasn’t irritated. Doesn’t harm her anyway. Now there’s no more of that, so cleaning is quite fast.
I use boiled water and cotton wool to clean in the lines