UV sterilizers will kill the free floating sexual reproductive stage of many species of benthic algae (the kind that grows on surfaces). So they will have some effect. However they will not stop vegetative reproduction (where the algae reproduces by cellular division) so I would not expect the use of one to clean your glass. Basically it may prevent new spots of algae from forming in the tank but it won't stop or clear up spots of algae that are already existing.
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