I put my son in laying down position so the water doesn't go to his face. x
No advice unfortunately as we’re in the same boat 😅 x
My son is the same!! Daughter was too. When rinsing the hair out, after i tell them to tip back, i start at the back slowly so I'd they to their head forward, none had a chance to get in their face yet and just have them tilt back again. Little by little i move from back to front. Repetition and to help them be more apt to avoid their instant reaction to pull away. They usually are better now that we've done that way forever. Well, she is fine now (8). He is usually better on most days.
No advice but I have the same issue with my little one so interested in any tips anyone has!