I have long hair and I use similarly looking solid shampoo. What I do is, that I rub it in both hands and it foams quite quickly and heavilly. Then when I have both hands full of foamy soap, I rub it in hair and wash them similarly to how I would with a liquid shampoo. Maybe it sounds weird, but it’s pretty quick and effortless. But it’s very dependent on how good the soap foams. If you have a solid shampoo that doesn’t foam well, you would need to repeat this procedure multiple times and could be annoying.
I have long hair and I use similarly looking solid shampoo. What I do is, that I rub it in both hands and it foams quite quickly and heavilly. Then when I have both hands full of foamy soap, I rub it in hair and wash them similarly to how I would with a liquid shampoo. Maybe it sounds weird, but it’s pretty quick and effortless. But it’s very dependent on how good the soap foams. If you have a solid shampoo that doesn’t foam well, you would need to repeat this procedure multiple times and could be annoying.