Yes! Regardless to your hair type, Deep cleanse your hair at least once a week.
If you wear shades or eyeglasses- do you know how dirty the lenses can get in the course of a day? Imagine your hair attracting as much residue or debris?
There are clarifying shampoos and deep cleansing shampoos. If you have a relaxer without heavy gels or grease buildup, then I recommend a deep cleansing shampoo such as Paul Mitchell Shampoo one or Design Essentials Organic Cleanse.
If you have a relaxer and HEAVY grease or sticky gels, then I recommend clarifying shampoo such as Pureology Purify, Paul Mitchell Shampoo Two or Rusk Clarify.
If you are color-treated or no chemicals at all, then choose clarifying shampoos for oily scalps. Careful, you do not need a clarifying shampoo every day! There are some daily shampoos and daily conditioners that are light.
Try to go for a clean scalp and clean strands without stripping excessive amounts of natural oil/shine.
If you have an extremely oily scalp, then clarify as much as possible. There are only a small population with extremely oily scalps. You will know your level of oil production by how fast your hair gets weighed down naturally.
If within 24 hours of a shampoo, your typically straight hair is weighed down again; then you probably have an oily scalp. This particular hair situation may need clarifying shampoo or a volume shampoo. Talk to your stylist about a good regimen for you.
After you clarify or deep cleanse, an appropriate moisture shampoo is needed and/or appropriate conditioner.
Relaxed hair definitely needs a moisture shampoo and a moisture conditioner layered with a little reconstructor after deep cleansing. (Careful, do not overdose on the protein.) Great reconstructors that also moisturize include: Paul Brown Hawaii Resurrect and KeraCare Intensive Restorative Masque. Paul Brown Hawaii Resurrect should have an instant moisture conditioner followed behind it just to make sure the hair is balanced. However, KeraCare Intensive Restorative Masque does not need a followup conditioner.
In summary, everyone needs two types of shampoos and one conditioner at a mininum.
Others may need more.