Invicible Kiln

Hello,
I've encountered problem after playing a while.So I've built Kiln and for long time it wasn't used but some days later i've decided to destroy because i've built it in wrong place...
And whem I'm trying to destroy I just hit it and nothing happens(for long time). After an 10 minutes of bashing it with my friend (45 and 100 phlegm) we dealt 1% of dmg to it.
Could somebody write answer how to destroy it or say it is meant to be that hard to destroy?
(If it is in wrong section I'm sorry.)
I've encountered problem after playing a while.So I've built Kiln and for long time it wasn't used but some days later i've decided to destroy because i've built it in wrong place...
And whem I'm trying to destroy I just hit it and nothing happens(for long time). After an 10 minutes of bashing it with my friend (45 and 100 phlegm) we dealt 1% of dmg to it.
Could somebody write answer how to destroy it or say it is meant to be that hard to destroy?
(If it is in wrong section I'm sorry.)