Need help with shrinkwrap modifier

Hi, I got a problem while modelling with shrinkwrap modifier, I have no idea what causes these lines on the surface, how do I get rid of them?

It’s a bit difficult to tell without knowing what is shrinkwraped to what.

Usual offenders for something like this:

  1. duplicate vertices
  2. interior faces

Also, what is the method for the shrinkwrap modifiers ? Target normal project is best in my experience.

I got it, there is no need to apply the modifier at all, just fix the topology on the model to achieve clean reflection.