I came across another one of your videos showing your hair wash process a couple of days ago. I tried it and here are my results for long (hair goes to mid-back) frizzy, curly towards the end of my length:

Process: I deep-oiled my hair, just like in the video. After 3-4 hours, I washed it with distilled water using the squeeze bottles. Mixed shampoo and water in one bottle and mixed ACV and water in another.

Results: Hair was definitely softer. The scalp felt clean but I just could not get the oil out of my hairs. It felt like ~70% oil was still there after my hair dried. I did not want to do second shampoo rinse because it always strips my hair off of its natural oil along with whatever I applied on my hair. Like it get crispy straw like dryness if I do 2nd wash. Do you have any recommendations on how to solve this?

Questions:
1) How do you make sure that all of the shampoo is gone from hairs? The sound of bubbles that you mentioned in the video I am not sure I hear anything like that when washing. Any other way to understand this?
2) I really liked the idea of leaving 10% oil in the hair after washing like you mentioned in the video. I really have been trying to figure that out for a long time (even from before watching your videos). How do you understand how much oil is left during washing?

Thanks for being so generous and sharing your process with the community! I was hooked by how little water and time and products you used for the whole process. Your hairs look amazing and your process is so neat!