Wash hair - toddler freaks out. Any tips?

FirstTimeMom💁🏻🤰🏻🤱🏻

My LO is 18 months and HATES washing his hair. We do it twice a week and he hates the water being poured over his head and now he knows it’s coming so will start crying and yelling before and pushing out hands away and tonight he cried for so long even after. Last time he moved so much to get away that he ended up swallowing and choking on the water he took in🤦🏻‍♀️ 😫

Help! It’s only getting worse 😰😰😰

Tried wash cloths and trickling water which is ok for wetting and shampooing but I can’t clean out all the shampoo.