Long hair - partial washing in between
Anyone who has long hair often has this problem as well: The hair on the top of the head is already greasy, but the longer part is still dry, often very dry from frequent washing. If you want to go fast or not every time the complete hair should be washed, I recommend a "partial washing" in between:
Tie hair together or hold it together with one hand, keep your head under the tap, only apply shampoo to the top of the head, massage in, rinse well, rub dry, maybe blow-dry - that's it!
Even the pony can be refreshed so fast without dry shampoo.