Chalky roots, ugh. Since becoming a pink haired fiend I've been washing my hair less and have become a slave to the wonderful world of dry shampoo. Always used it since it become the new thing but just never as much as I have in the last few months! Personally I love the Batiste brand as it comes in so many yummy varieties, but following that is Klorane, the scent may not be as delicious by but god it does the degreasing job like no other! Both of these varieties can be easily found at Priceline.
Anyway, I've discovered a neat little trick to avoid the chalky roots that makes it so obvious that you didn't have the time to wash your hair.
Spray your hair with dry shampoo the night before! You want to do it the usual way, shake the bottle, lift sections of your hair to focus on your roots and remember that a little can go a long way.
By doing this you ensure that while you're sleeping, the product will get dispersed throughout your hair and you won't get obvious marks. You may need to change your pillowcase, but to me that's a small price to pay for perfectly non greasy hair the next day.
Have you got any other nifty tricks for dry shampoo? What brands do you use?