1) Acrylic/ABS Bathtub Aqua Hydra Massage Bathtub Hot Tub 2)Certificate: CE,RoHS,LVD,EMC, ISO,UL, ... detergent!2. How to remove the scratch from the bathtub surface: Use 1500# sand paper to polish the scratch ... such as lemon juice, vinegar sauce4.Heat tolerance: the bathtub cannot touch the heat source which is higher than ... tolerance: cannot use hard objects, blade devices to touch bathtub surface!