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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Clothing Repel

Product ID: 52495749

Details

Brand
Granger's
Item form
Liquid
Item volume
300
Material Type Free
Solvent free
Material feature
Cruelty Free
Number of items
1

🌿PFC-free, eco-friendly & cruelty-free

💧300ml powerful wash-in reproofer

🧥Restores durable water repellency (DWR)

Description

💦 Stay dry, stay fresh, stay ahead—waterproofing that works as hard as you do!

ECO RESPONSIBLE FORMULA - Protect the planet while you protect your gear with PFC-free, bluesign approved ingredients.
MAXIMIZED BREATHABILITY - Stay dry without sacrificing comfort—breathable protection that moves with you.
UNIVERSAL COMPATIBILITY - Perfect for Gore-Tex, eVent, FutureLight, and all your technical outerwear essentials.
NEUTRAL UNSCENTED EXPERIENCE - No overpowering smells or optical brighteners—just pure, clean performance.
ALL OVER DURABLE WATERPROOFING - Revive your gear’s original DWR with every wash for unstoppable outdoor confidence.

Grangers Clothing Repel is a 300ml wash-in reproofer designed to restore durable water repellency on technical and outdoor clothing. Its breathable, PFC-free, and eco-friendly formula is suitable for all waterproof membranes including Gore-Tex, ensuring long-lasting protection without compromising comfort or the environment.

Specifications

ASIN	B00R1FOBDY
Benefits	Water repellent for technical and outdoor clothing
Best Sellers Rank	7,914 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 73 in Waterproofing & Cleaning
Brand Name	Granger's
Cleaning Agent Formulation	Detergent
Container Type	Bottle
Contains Liquid Contents?	Yes
Country of Origin	United Kingdom
Customer Reviews	4.2 4.2 out of 5 stars (822)
Global Trade Identification Number	00799756005031
Included Components	1 bottle
Item Form	Liquid
Item Type Name	Proofer
Item Volume	300 Millilitres
Item Weight	0.63 Pounds
Manufacturer	Grangers International
Material Features	Cruelty Free, Eco-Friendly
Material Type Free	Solvent free
Model Number	GRF74
Number of Items	1
Part Number	GRF74
Product Warranty	3 Years
Recommended Uses For Product	Waterproofing Outdoor Clothing
Scent	Unscented
Size	300 ml (Pack of 1)
Specific Uses For Product	Outdoor activities
Surface Recommendation	Fabric
UPC	799756005031 799756006502
Unit Count	300.0 millilitre

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