How Does Anhydrol Forte Roll On Work? Anhydrol Forte Roll On contains Aluminium chloride which helps to block the sweat glands to control the problem of excessive sweating. Anhydrol Forte Roll On is a clear, odourless formulation & can be used to control sweating in affected areas such as the underarms, hands & feet. How To Use Anhydrol Forte Roll On Adults, elderly & children: Apply Anhydrol Forte on clean, dry skin before bedtime. Rinsing off in the morning. Anhydrol should be used on small areas only. It is recommended that Anhydrol is used initially for 2 consecutive nights then having a break for 2 nights. Then the treatment should be continued again for 2 nights, followed by another break for 2 nights. By alternating the treatment in this way you can monitor your response so you can adjust your treatment accordingly. Do not shave the armpits within 12 hours before or after using Anhydrol Forte. Do not wash or bathe immediately before applying Anhydrol.