Everyone pitched in. Many people themselves suffered property destruction, or at the very least had friends or family that did. Governments planned initiatives to clean up war debris, but on a smaller scale locals would've also done their fair bit of cleaning for themselves or those around them in order to rebuild their homes and livelihoods.

In fact, people to this day are STILL cleaning up from WWI and WWII. There are many areas on the Eastern and Western fronts (of both World War I and World War II) where the Iron Harvesr happens — the1 recollection of unexploded war munitions. Every year European farmers plough the ground and unearth new ones.

https://en.m.wikipedia.org/wiki/Iron_harvest