How to say “Someone spilled ink on this conservation table years ago, and the mark never came out.” in Japanese

In Japanese

何年(なんねん)も前(まえ)に誰(だれ)かがこの修復作業台(しゅうふくさぎょうだい)にインクをこぼして、跡(あと)が取(と)れないままなんだ。

nan-nen mo mae ni dareka ga kono shūfuku sagyōdai ni inku o koboshite, ato ga torenai mama nan da.

Someone spilled ink on this conservation table years ago, and the mark never came out. in other languages