New tarmac, any advice how to remove these stains?

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20 Aug 2018
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United Kingdom
Hi, we had new tarmac and new kerbstones laid October 2019. Last year we noticed staining both brown and whitish spreading from the kerbstones but assumed it would wash away with rain.
The staining has got progressively worse and we have tried to wash and brush it off with water and washing up liquid but it didnt shift it.
The soil in the borders is heavy red clay, and is topped with a membrane and a layer of bark/wood chip.
upload_2020-7-7_13-59-10.png

Does anyone have a way of removing these stains?
 
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