This study is a comparison between Clobetasol Propionate Spray and Clobetasol Propionate Ointment with Regard to Efficacy, Safety, Subject Satisfaction and Duration of Response in Moderate to Severe Stable Plaque Psoriasis. Subjects will be enrolled and randomized into one of two groups: clobetasol propionate Spray for 4 weeks of treatment or clobetasol propionate ointment for 2 weeks of treatment with a 2 week follow-up visit for each group.