Simple Solution Extreme Stain & Odour Remover is 3 X stronger (vs Simple Solution Stain & Odour Remover) the only formula which contains both Pro-Bacteria and enzymes which effectively eliminate tough dog and cat odours and stains faster. Extreme Stain and Odour Remover is a professional strength formula specifically designed to clean mess from pets such as vomit, urine and faeces, completely eliminating your home of pet stains and odours and discouraging pets from repeat marking.