Simples! We take the next feature that we are asked to build, and instead of detouring around all the weeds and bushes, we take the time to clear a path through some of them. Maybe we detour around others. We improve the code where we work, and ignore the code where we don’t have to work. We get a nice clean path for some of our work. Odds are, we’ll visit this place again: that’s how software development works.