Washing your hair before colouring might seem like a no-brainer—but it’s one of the most misunderstood steps in the hair dye process. Whether you’re visiting a salon or applying at home, understanding when and how to wash can make or break your colour results.
In this expert guide, we’ll explain when to wash, what products to use, and how brands like Hair Folli can support healthy, colour-ready hair without harsh chemicals.
Why Clean Hair Matters (But Not Too Clean)
Hair dye adheres better to strands that are free of heavy buildup—but over-cleansing can strip away natural oils that protect the scalp during the colouring process. The sweet spot? Slightly dirty hair that’s not overloaded with styling residue.
Washing 24 to 48 hours before dyeing is ideal for most people. This timing lets your scalp’s natural oils rebalance while still removing surface grime that could block colour absorption.
When You Shouldn’t Wash Your Hair Before Colouring
Should I Wash My Hair Before Dying It?
Avoid washing your hair right before colouring if any of the following apply:
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Your scalp is sensitive, irritated, or recently treated
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You’re planning to use bleach or a lightening product
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You’re getting a single-process, all-over colour and your hair is already clean
In these cases, your scalp’s natural oil layer acts as a protective barrier, reducing the risk of irritation and helping the dye adhere more evenly.
Best Products to Use Before Hair Colouring: Drugstore vs. Salon
Not all shampoos are created equal when it comes to pre-dye prep. Choose carefully to avoid stripping or interfering with your colour.
Drugstore Clarifying Shampoos
Look for sulphate-free, pH-balanced formulas designed to remove residue without drying out the scalp. Avoid anything with strong fragrance or alcohols, which can sensitise your scalp before colouring.
Salon-Grade Prep Products
These are formulated to prime the hair shaft without affecting dye molecules. They often contain bonding agents or gentle cleansers to maintain strength and porosity before chemical treatment.
Hair Folli’s Hair Growth Shampoo is an ideal bridge between both worlds. It’s vegan, sulphate-free, and gentle enough for bleached or chemically treated hair—making it a standout in the category of top-rated vegan hair care products. By cleansing without irritation, it helps prep hair for colour while supporting long-term scalp health. It’s an excellent choice for those looking to upgrade their routine with a clean, effective formulation trusted by Australian users.
Tips for Prepping Your Hair the Right Way
- Avoid heavy oils, silicones, or masks 48 hours before colouring
- Don’t scratch your scalp before dyeing—this can cause stinging
- Air-dry hair instead of heat styling before your appointment
- Use a microfiber towel if washing before a home dye job
These simple habits help prevent unexpected results or scalp irritation.
FAQs: Should I Wash My Hair Before Dying It?
Will washing my hair strip the dye?
No—if you wash before dyeing, not after. Washing too soon after dyeing is what risks fading. Before colouring, washing gently is beneficial in most cases.
How long before dyeing should I wash my hair?
Ideally, 24 to 48 hours before. This gives your scalp time to restore its natural oils without being too oily for colour adherence.
Can I dye dirty hair?
Lightly dirty hair is okay, but avoid dyeing heavily oily or product-laden hair—it can block dye penetration and cause uneven colour.
Is dry shampoo okay before colouring?
No. Dry shampoo leaves residue that can prevent colour from bonding evenly. Wash it out at least 24 hours before dyeing.
What shampoo should I use before dyeing?
Use a sulphate-free, pH-balanced shampoo. Hair Folli’s Hair Growth Shampoo is a gentle choice that supports clean, colour-ready hair.
Final Thoughts: Prepping Smart = Colour That Lasts
The secret to vibrant, even hair colour starts before you open the dye box. Knowing when to wash—and what to wash with—can make a dramatic difference in how your colour sets and how long it lasts.
Whether you’re going bold or just covering greys, prepping with clean, gentle products like Hair Folli’s sulphate-free range helps ensure your scalp is protected and your hair is ready to shine—no irritation, no fade.
Author: Hair Folli Content Team
Hair Folli is Australia’s trusted provider of natural hair care and growth solutions. Our sulphate-free, plant-powered formulas are safe for bleached or colour-treated hair and deliver visible results without harsh chemicals.