Would this work on a jacket with "weather-resistant cotton-poly body" which doesn't have much resistant to water at all?

I believe this is made for synthetic fabrics, specifically for Goretex. If your jacket has a significant blend of cotton (>25-30%), I would suggest you try using a fabric wax (for example: Otter Wax). This WILL change the texture and look of your garment, however, it will add waterproofing and durability.

Must this be used by itself? Or can add it to detergent already loaded in the washing machine?

You would use this in place of the detergent. The bottle has instructions but it has a ratio of how much you need per jacket/ items you are waterproofing. Footprint USA is an authorized Amazon dealer for Grangers USA.

Do i always need to first wash it with "performance wash", then only if i need to re-treat the dwr, do i wash it again with the "clothing repel"?

No, if the garment is not dirty. If it is even slightly dirty, wash with Performance Wash then wash with Clothing Repel in two separate wash cycles.

Can I use this with a top load washer? What are the instructions for use with a top load washer?

I personally use a top load washer, and I put two cups in the top load washer. So far it has worked great for me.

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Grangers Clothing Repel (300ml/10fl oz)

Product ID: 16168889

Details

Brand
Granger's
Item Form
Liquid
Material Feature
Natural
Scent
Unscented
Specific Uses For Product
Outdoor

💧300ml powerful waterproofing

♻️100% recycled plastic bottle

🌬️maximizes breathability

¥6489

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💦 Gear Up, Stay Dry, and Lead the Pack!

NEUTRAL UNSCENTED - No overpowering smells or optical brighteners—perfect for hunters and outdoor purists.
BREATHE EASY STAY DRY - Preserves original fabric breathability for all-day comfort during intense outdoor activities.
UNIVERSAL COMPATIBILITY - Works seamlessly with Gore-Tex, eVent, Pertex, FutureLight, and all breathable waterproof membranes.
RESTORE YOUR GEARS DWR - Effortlessly renew durable water repellency for rainwear and technical outerwear.
ECO CONSCIOUS WATERPROOFING - PFC-free, bluesign approved formula in a fully recyclable bottle—protect your gear and the planet.

Grangers Clothing Repel is a 300ml wash-in waterproofing treatment designed to restore durable water repellency on technical outerwear while maintaining breathability. Eco-friendly and PFC-free, it’s suitable for Gore-Tex and other membranes, packaged in a 100% recycled bottle for sustainable outdoor performance.

Specifications

ASIN	B00R1FOBDY
ASIN	B00R1FOBDY
Best Sellers Rank	#186,237 in Health & Household ( See Top 100 in Health & Household ) #974 in Liquid Laundry Detergent
Brand Name	Granger's
Customer Reviews	4.3 4.3 out of 5 stars (821)
Date First Available	September 30, 2011
Department	unisex-adult
Global Trade Identification Number	00799756005031
Included Components	1 bottle
Item Form	Liquid
Item Highlight	Wash-In Waterproofing Solution For Technical Outerwear, Suitable For GORE-TEX, Restores DWR, For Hardshell, Pants, Jackets
Item Type Name	Clothing Repel 10oz
Item Volume	300 ml
Item Weight	10.08 ounces
Item model number	GRF74
Manufacturer	Grangers
Manufacturer	Grangers
Material Features	Natural
Material Type Free	unscented
Model Number	GRF74
Number of Items	1
Part Number	GRF74
Product Benefits	Eco-friendly waterproofing treatment for outdoor gear
Product Dimensions	8.07 x 1.97 x 8.07 inches; 10 ounces
Scent	Unscented
Size	10 Fl Oz (Pack of 1)
Specific Uses For Product	Outdoor activities
UPC	799756005031 799756006502
Unit Count	10 Fluid Ounces
Warranty Description	Standard

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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The product quality is outstanding. Exactly what I needed for my work.

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¥6489

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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4 days ago

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