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> The “toxic” part of the soil, perchlorates, are easy to process and remove.

On a planetary scale? How?

Why would you need to do it on a planetary scale?

Just the soil colonists will be using is all you need.

So... only that part of the soil that gets picked up by the famous Martian dust storms then? Aka the entire surface?

Nothing will be grown outside on Mars for hundreds of years. Even with an active terraforming operation, they will need some kind of dome enclosures to provide enough air pressure to grow plants for centuries.

Until then, just rinse off your suit and boots when you enter the dome.

Assuming a para-terraforming model there might not be a need to cater for a planetary scale removal I suppose.

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