In article , Andrew Gabriel writes
>> What's the best way of getting rust marks off brickwork?
>> Is it just a case of using a wire brush and elbow grease or is there a >
>No - wire brush will leave more metal on the brickwork, which then goes
>rusty (if it's steel brush) making it worse.
>
>> solution that will help?
>
>Acids would probably work, but might damage the mortar (particularly
>if it contains lime). Many years ago, I recall buying a rust dissolver
>for preparing rusty car bodywork for repair -- that might work but
>test on a small area of brickwork and mortar for bad effects first.
>A rust stain remover might work.
>
Isn't oxalic acid the thing for this? I think that's what rust stain remover is.