Diaper rash at butt cheek fold

My child’s butt will have tiny red bumps or full blown redness after every poop. Sadly, not all caregivers are that meticulous to realise he has pooped. Sigh. So we used to apply Ceradan diaper cream but recently I switched to plant based baby powder (talc free) and somehow it works even better! Not cheap but powder texture is extremely soft/fine. It’s quite obvious when other caregivers forget to powder because my child’s butt will develop the red bumps. So first thing when I get home is change his diapers and powder him. Also, I tried to make sure everyone washes my child’s butt with warm water/ Mustela cleansing water after poop.