red pindan dust and stains from trees on caravan awning

We have spent 2 hours scrubbing with a scrubbing brush) our caravan awning, (canvas) firstly with truck wash and then with Ajax professional, it is better, but still not good enough.
It has red pindan dust and stains from trees on it, can you help please.?
We have just returned from the Kimberley and the Pilbara, hence the red dust.

32430cookie-checkred pindan dust and stains from trees on caravan awning

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Anonymous
Anonymous

3/4 vinegar and 1/4 morning fresh in a spray bottle then spray on the area to be cleaned. It was magic. I thoight our stuff was stained forever but this simple solution is awesome. Needs to be rinsed well.

Dr Chemical

It’s either clay or iron based. If it’s clay you won’t shift it – clay is very chemically inert. If it’s iron you’ve got a chance – Ajax Professional contains phosphoric acid which will help, as you have tried. I believe you can get a phosphoric acid based product from Bunnings that is used for getting borestains off – don’t know what it’s called though