Who cleaned up after WW2?

In Germany it was the Germans there is a documentary about the Take over of Berlin showing civilians cleaning up in all sectors

In London we cleaned up parents and children but us kids were More into Souvenir Collecting

the British used German Army EOD/UXB trained Personnel to clear the Mines and Booby traps under supervision

Inside cities like Stalingrad the mess was removed when they rebuilt the city. But places like Kursk, except fro the bodies there was no cleanup. You can still go their and see rusted tanks out on the Steppe. The same for Normandy, Bastogne, St Vith. There are still old rusted hulks lying around the fields and in the forests. They still occasionally find a 5" Rocket or a un-exploded 105 MM round in farmers barnyards on occasion.

The cleanup is still going on - in Germany six weeks ago they found and removed a 4000 lb bomb.

Lady Di had a favorite cause; she supported the removal of landmines from various countries.

Effectively the Allies started the effort and funded local governments in using local labor in the effort.

Scrap metal was needed for munitions and arms production.