Get started now
I think legacy mode block feature can do that.
It has a tick for including invisible layers which can ensure you to disable all layers you want to keep, then block-select all the unwanted clutter and delete, then re-enable the wanted layers.
You can choose the Edit menu and select Global Deletions, then you can select the items you want to delete and check Current layer only and make sure you have the proper layer selected in the layers tab.
PCB Instant Quote