Would this lighten elm wood?

I think it would depend on the size of surface area. A friend used it to remove black stains from oak.

I have a rust stain on a tarmac driveway. Can I use this product to remove it?

Try Cola, yes the drink this stuff lifts all sorts of stains..i used it on my drive way to get rid of oil stains. It really works, pour on agitate a bit leave a few hours rinse with water. Repeat if necessary. I kid you not it really works. ( hate to think what it does to the human inners🤢)

Will it remove rust like stain on paving flags caused by garden aftercut treatment

Possibly - depends how long the rust has been there. Could be flash rust.

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Pure Chem Oxalic Acid Cleaner 5% Solution, Oxalic Acid Wood Bleach 1L

Product ID: 345212038

Details

Brand
Pure Chem
Item Highlight
Pure Chem Acid
Item form
Liquid
Item volume
1 Litres
Percentage assay
5

🧪5% pure oxalic acid concentration

⚙️Effective rust & stain removal agent

🛢️1L industrial-grade liquid solution

¥10472

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.

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Description

⚡ Restore brilliance, banish rust — the pro’s secret weapon!

VERSATILE RUST STAIN REMOVER - Effortlessly restores metal & surfaces to pristine condition
POWERFUL 5 OXALIC ACID FORMULA - Precision cleaning with industrial strength
SAFE HANDLING WITH CLEAR WARNINGS - Comprehensive safety info ensures responsible use
1 LITRE PROFESSIONAL GRADE CONTAINER - Ample supply for multiple heavy-duty applications
TRUSTED BY INDUSTRY HOBBYISTS ALIKE - Top-rated with 224+ reviews and a 4.1-star average

Oxalic Acid 5% Solution is a potent liquid cleaner designed for industrial and professional use, specializing in rust removal, stain bleaching, and metal surface restoration. Packaged in a convenient 1L container, it forms stable, water-soluble complexes with iron, making it highly effective for automotive, marine, and lab applications. With strong customer approval and clear safety guidelines, it’s the go-to solution for managers seeking reliable, high-performance maintenance chemistry.

Specifications

% Assay of Chemical(s)	5
ASIN	B0721TC3BM
Best Sellers Rank	9,259 in Automotive ( See Top 100 in Automotive ) 58 in Rust Converters & Rust Removers
Brand	Pure Chem
Customer Reviews	4.2 4.2 out of 5 stars (229)
Item Form	Liquid
Item Highlight	Pure Chem Oxalic Acid Cleaner 5% Solution, Oxalic Acid Wood Bleach 1L
Manufacturer	Trade Chemicals
Manufacturer Part Number	TCOXAS1LC
Volume	1 Litres

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How is product pricing calculated?+

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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¥10472

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

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

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