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We offer worldwide shipping services to almost every destination. Please note that some items may have shipping restrictions, and certain products cannot be delivered to international locations. At checkout, the system will estimate your shipping and delivery dates based on item availability and your chosen shipping method. Delivery time estimates may appear on the shipping quote page, depending on the carrier you select. Additionally, shipping fees for many of our products are weight-based. The weight of any such item can be found on its detailed product page. To reflect the policies of our shipping carriers, all weights will be rounded up to the next whole pound. We provide a 30-day free return policy. If the return is due to our responsibility (such as product quality issues or incorrect shipments), shipping costs will be covered by 40buy.com. For returns, please contact our customer service team via the WhatsApp icon in the lower right corner of our website. All products purchased from 40buy.com come with a quality guarantee – shop with complete confidence.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
【Carbon neutral】
Our store is committed to ensuring your payment security. We use industry - leading encryption technology to protect your payment information. All transactions are processed through trusted payment gateways such as Shop Pay, PayPal, Stripe, and credit card companies. Rest assured, your financial data is in safe hands.
Science-Driven Clean Hair Revolution
Born in MIT labs and perfected by elite stylists. Our patented Clean-O2™ technology eliminates oil at the source—no masking, just real results.
Why We Stand Out
✅ Deep Cleansing: Shower-fresh actives balance scalp sebum, ditching starch-based cover-ups.
✅ Invisible Finish: Zero chalky residue, even on jet-black hair. Silky texture beats gritty traditional formulas.
✅ 24/7 Defense: Talc-free formula absorbs gym sweat and fights urban pollution.
For Your Lifestyle
✨ Post-Workout Rescue: Erase sweat and oil in 30 seconds—your SoulCycle locker room hero.
✨ Style Extender: Maintain blowouts for 3+ days. Your secret to Coachella-ready hair.
✨ Curl-Approved: Zero frizz residue. Pair with diffuser for defined curls.
How to Use
1️⃣ Shake 10+ times (like a Polaroid picture!).
2️⃣ Spray 8 inches from roots in sections.
3️⃣ Wait 30 seconds—let science work.
4️⃣ Massage or blow-dry for salon-fresh hair instantly.
Q: Will this leave white residue on dark brown hair?
A: Passed the "Black T-Shirt Test"! If traces appear, brush or blow-dry with cool air—gone in 5 seconds.
Q: How does the scent differ from the original?
A: Advanced Clean has a light linen fragrance (no heavy perfumes)—ideal for scent-sensitive users.
Q: Does the nozzle clog?
A: Non-clogging design works till the last spray. If issues arise, message us for a free replacement—no questions asked!
Q: How do I request a 30-day return? Is return shipping free?
A: Free returns within 30 days! Contact us for a prepaid label. Product must be undamaged with all accessories.
Q: What’s the international shipping time and cost?
A: Free global shipping! Orders ship in 1-3 days, delivery within 7-15 business days. Track your package in real-time.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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