PreWash Stain Remover Extrastrength bioenzyme formula gets out tough stains. Proven more effective. In independent testing, Carbona Stain Wizard was proven to be more effective on stains than other prewash stain removers.The builtin applicator brushtop gently helps loosen stains for thorough removal. And the extrastrength bioenzyme formula penetrates and breaks up stains to remove them quickly and effectively from most fabrics. Plus, the allnatural formula is safe for all washable fabrics and environmentally friendly.