[Scottish Cleaning Service]

One of my customers mixed Iron sulphate in a watering can on his nice new white patio. It now has plenty of brown marks which he wants me to remove. Has anyone used a good chemical which works  before I try a few non-starters. Tried white vinegar and lime juice to no avail. Next thing I will be trying is baking soda. Bought 5 litres of a chemical from Bonnymans years ago but can't seem to find it. Thanks m

[CleanClear]

You need oxalic acid.

https://www.diy.com/departments/owatrol-net-trol-wood-cleaner-restorer-1l/3297971008204_BQ.prd

https://www.diy.com/departments/purechem-oxalicacid-5-solution-1l/5060542701754_BQ.prd

[Simon Trapani]

One of my customers mixed Iron sulphate in a watering can on his nice new white patio. It now has plenty of brown marks which he wants me to remove. Has anyone used a good chemical which works  before I try a few non-starters. Tried white vinegar and lime juice to no avail. Next thing I will be trying is baking soda. Bought 5 litres of a chemical from Bonnymans years ago but can't seem to find it. Thanks m

This is the window cleaning section.

And I don't understand wtf you get involved? Cleaning windows is so much easier & pays well enough.

[Splash and dash]

Rust Bon from Bonnymans will remove it

[Rob.Hall]

Benz soft wash do a rust remover.
It's excellent!
I have used it with great success.
Just follow instructions.