Not from lack of trying or drying up all the water that my boys splash around in the tub we still manage to get mold in the seams of the tub inside and out. I was just using bleach and water and that wasn't working so i asked my mom and she suggested CLR. This product doesn't have the strong smell of chemicals like bleach so for that i loved this product. Its been a little over 4 days and i haven't seen any return of the mold. Tonight I am going to clean up and dry the area real well then spray the CLR to try to prevent it from returning. I will keep you all updated on how well the product is working for me. So far i am very pleased with this product.