Special effects are destroyed when the unit they are attached to dies?

[CoLd Bon3]

Hello, mates! The title says it all.
I have my spell that creates an effect dummy and kills it after a set amount of time. There are also special effects attached to it. Will they be destroyed when the unit dies, or i have to store them in a variable and destroy them manually?
I mean, when the unit dies, the effects can't be seen anymore, but have they leaked?

 

[defskull]

Yes, it leaks.
You need to manually destroy them.

 

[CoLd Bon3]

Ok, thanks a lot!