Brown CRB Brushes

[Bryce C]

Have any of you found a substantial improvement cleaning grout lines with brown crb brushes, or do the blue brushes work well enough with good chemistry and dwell time as long as they haven't lost all of their bite from years of use?

For normal home tile and grout cleaning I think I'll keep using blue brushes for simplicity sake and streamlining. But I have a commercial job with quite a bit of tile and grout coming up and I am debating buying some brown crb brushes just for large and heavily soiled tile jobs.