It's possible you need to clarify, if this is happening often. Use a clear shampoo (ideally with sulphates, if your scalp can handle them) and lather up all of your hair - lengths as well, you can gently squidge the hair to make it lather - and let it sit for a few minutes. You might want to repeat, particularly if you've never knowingly clarified or you use heavy products. Then follow up with a long, deep conditioning if you can, to remoisturise your lengths.
Regarding the original question, what helped my hair go longer between washes was finding a moisturising enough wash routine to keep my lengths happy. Then I could do scalp washes in between to keep my scalp happy.
Keeping my lengths happy involves pre-poo oiling several hours before (a day or two before is ideal), conditioner on for an hour or so before the wash, shampoo, oil rinse on the lengths, and a fairly long conditioning afterwards while I scrub my body then detangle my hair. This way my lengths go 2-4 weeks being fine.
My getting here was gradual though, I went from shampoo+conditioner every two days, to every 4 days with a scalp wash in between, then as I needed to be presentable less and less often, the time got longer and longer. A few years ago I wash washing once a week with a scalp wash or two in between, then a couple of years ago it was every 2 weeks, and now it's kind of whenever my scalp gets fed up of scalp washes and needs a thorough scrub. I do keep my hair in a bun though, which is a huge factor in the lengths being happy for so long. If I have to braid (e.g. for a dentist appointment) they start to feel dry and I have to wash again sooner than when I keep it in a bun. I also don't manipulate it all that much, just wrapped buns and I don't always redo them every day either. Really emphasising the *neglect* part of benign neglect
I will also point out that by day 3 my hair looks oily, so if I had to look presentable I'd still be having to do scalp washes every other day. I can get away with it being oily when the vast majority of my limited visible contact with the world is over Zoom!
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