you can do a conditioning shampoo or a vinegar rinse to clarify the hair . . . it will remove any build up.
It also might be that you are just paying more attention to your hair . . . and that's why you're noticing the knots (that's the way I feel about my splits!

)
My hair deflates faster than yours! Mind deflates in about 15 minutes . . .
Ahhhh, the glories of fine hair! LOL
I get frustrated with it, but I LOVE my hair!
Hang in there!
???/ 35/ 36
2aF/Mii
"Heaven-spun gold" with a sprinkle of gray
~~*~~
Never think that God's delays are God's denials.
Hold on; hold fast; hold out. Patience is genius.
-- Comte de Buffon