Just gave this a crack on our bathtub. As you can imagine, Celeste uses a lot of products in the bath and shower. They leave a lot of oily residue which I think makes the dirt stick. Had been using the Murchison-Hume Boys Bathroom cleaner with some success but when I used this brush with it the grime just came straight off! No hard scrubbing required. The only reason I gave it 4 stars was that I wish the bristles came right to the end of the brush to get into corners easier, otherwise I couldn't believe how effective it was. Highly recommended!