Agree with Textan49. However, the ear process might be able to speed up if
You don't make eye contact --- none, zip, zero, nada, look at the floor
I am 5'2" and found that out by complete accident when I was trying to clean the insides of my 16.1H TWH's left ear. Someone must Have twisted or pulled that ear to keep him quiet, before I bought him, because he's fine with the right ear.
I have a bad case of vertigo from an accident, can't look up without passing out, and was too lazy to go after the foot stool. I stood on my toes, put my head down and stretched, lightly rubbing the outside of his ear with a wet paper towel. To my amazement, he stood a lot more quiet without me looking at him, so that is how I now clean his ears., my head down, looking at the floor.
If you can afford it, all of my horses loved the inside and outside of their ears cleaned with a paper towel soaked in Vetericyn. <-----it might get you to your goal faster.
BTW, I still have the Arab I rescued 22 years ago, he just had his 29th Bday. They are smart to their own undoing but extremely loyal and loving, just as soon as they feel we have earned it
Good luck with your fella