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.

Clothing Proofer | Desertcart UK

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Description

💧 Stay dry, stay ahead — proof your adventure-ready style!

EFFORTLESS APPLICATION - Cold water activation means no heat required—proof your gear anytime, anywhere.
UNIVERSAL COMPATIBILITY - Perfectly safe for all Gore-Tex and eVent fabrics, trusted by outdoor pros.
BLUESIGN APPROVED QUALITY - Certified for sustainability and safety, aligning with your values and lifestyle.
ECO CONSCIOUS PERFORMANCE - Fluorocarbon-free formula that protects both your gear and the planet.
REVIVE YOUR GEARS SHIELD - Instantly restores durable water-repellent finish to keep you dry and unstoppable.

Grangers Clothing Proofer is a fluorocarbon-free, environmentally responsible liquid treatment designed to restore the water-repellent finish on outdoor apparel. Compatible with Gore-Tex and eVent fabrics, it works effectively in cold water without heat activation and is bluesign system approved, ensuring sustainable, high-performance protection for your gear.

Specifications

ASIN	B00R1FOBDY
Best Sellers Rank	#119,842 in Sporting Goods ( See Top 100 in Sporting Goods ) #95 in Camping Waterproofing & Cleaning Equipment
Brand	Granger's
Brand Name	Granger's
Contains Liquid Contents?	Yes
Customer Reviews	4.3 out of 5 stars 798 Reviews
Global Trade Identification Number	00799756005031
Included Components	1 bottle
Item Form	Liquid
Item Type Name	Proofer
Item Volume	300 Milliliters
Item Weight	283 g
Item form	Liquid
Item volume	300 Milliliters
Manufacturer	Grangers
Material Features	Natural
Material Type Free	Fluorocarbon-free
Material features	Natural
Model Number	GRF74
Number of Items	1
Part Number	GRF74
Product Benefits	Water repellent for technical and outdoor clothing
Scent	Unscented
Size	300 ml
Specific Uses For Product	hiking
Specific uses for product	hiking
UPC	799756005031 799756006502
Unit Count	300.0 Milliliters

Reviews

M**N

Repellent

26.11.2020

H**O

素晴らしい！

洗剤と撥水剤と合わせて買いました。ウェアが綺麗になって撥水効果もバッチリです。

14.06.2021

A**R

Wash-in, don’t spin-out

14.05.2020

C**Q

Cumple con su funcion

Lo utilicé con ropa de cordura y goretex. Una vez seco, lo pasé por una secadora a temperatura media. Repele totalmente el agua.

7.11.2018

M**N

Water reroofing wash

23.09.2025

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