Graffiti on bridges

If my bridge engineering company wants me to help repair a broken bridge, but the existing bridge has grafitti, is my income halal? the grafitti might have no bad words or haram things but just gangs writing random stuff

Wa alaykum salaam,

Your job of repairing the bridge is absolutely fine.

Allah knows best

I live in one of the most corrupt cities. Just thought that it might incourage people to join gangs or help put a postive image of them when its not. weird question but i have waswas