After reading more into the rules I fear I owe my opponent an apology... I (wrongly) used all the below methods to remove his scrap markers (Mei Feng) and therefore controlled his game. Could you please verify if I understood everything correctly now?
Drachentrooper, Clear the area: At the end of this model's activation, it may remove all Corpse and Scrap Markers within 3. This is my only legal way to remove Scrap Markers with Freikorps models, correct?
Drachentrooper, Burn it down: Remove all destructible markers within range.... This would only apply to markers like ice pillars, that are described as destructible, and not to scrap markers, correct?
Rocket Launcher, Blow it to hell: Drop a blown apart marker within range, then remove any destructible terrain within 2. This would not even apply to ice pillars since they are markers and not terrain, and of course not to Scrap Markers since they are not destructible, correct?
Any Model, Interact: Interact can only remove scheme markers, but not scrap markers, correct?