Remove unsightly limestone edges of plants on limestone

Every single one of my bowls I experience anew every summer that my plants leave ugly limestone edges on the limestone on the terrace. After much testing and trying, I finally tried one thing:
I wet the edges dripping with water and sprinkle white laundry detergent over it, allowing it to soak overnight.

And indeed, the next day, the edges that had resisted every fight were almost dissolved! If you treat such edges in time, it works great!

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