How can I "clean" my model of unused plants?

[MATRADI]

When I insert a new plant from Forest in my scene, I noticed that some new objects appear as hidden and frozen objects, with names such as:

_forest_library_SV2JUAQ_fp_flowering_meadow-3__forest_library_GBASQZY_hypoestes_aristata_single_f-2

I understand that those objects are necessary, as the "origin" of the instanced plants. But what I don't like about Forest is that, in case I decide to delete the plants created, these hidden objects remain, increasing the size of my scene unnecessarily, and complicating things in case I decide -for example- to submit my model to a render farm.

The question is: how can I "clean" my scene, I mean delete all those objects that are no longer used? It's obvious that I can show them and unfreeze them, but in this case, I could delete other objects that are necessary for the plants that I already have.

Thanks.