Can't remember where I saw it (maybe
www.healthyhairjourney.com ) but one of the things this lady does is comb and part her hair in 4 sections and shampoo each section at a time. Immediately puting the hair back up and moving on to the next section.
I did this the last time I shampooed due to all the shedding I was having and I was very pleased with the results.
There is no tangling because you're only working with small sections at a time if this makes any sense. Try it and I'm sure you'll be pleased, I was.