How to get rid of polluted ground tiles?

[Dragony]

Hi!

So my tailings pond has overflown and that ugly tiles slowing you down have been lying around for some ages. Now I have invented flamethrower and they burnt well, but now it looks even uglier and the tiles still slow you down. Black tiles with semi transparent tiles mix up and when I use the deconstruct planner on it there are some invisible new icons to mine, but they don't give anything. I suppose they are called ninja-trees in the mod?

It seems to stay that way, but I want to get it cleaned up. With that missing tile transitions it looks even uglier than before.

What can I do except using concrete? I want to avoid using concrete because I want to create a base on natural ground.

[D0rus]

Have you tried to burn the resulting tiles? Burning should allow you to get rid of them.