“Remove your crew completely if you want.”
1. whole wall or just a small section, if small section, feather mask it in then box blur. It’s what you want, but it’s not a one click solution.
2. Or just try some effects that don’t just do regular blur. there’s one called a box blur, said above, which will give great results. Try using it with effect->levels to reduce the black crew, then the box blur will even out nicely(put levels above blur in controls) .