Dual Action Carpet & Upholstery Brush The Dual Action Carpet & Upholstery Brush harnesses the power of your dual action car polisher to deep clean carpet and upholstery. This durable 5 inch dual action carpet brush attaches to a backing plate via hook and loop. The Dual Action Carpet & Upholstery Brush works great for cleaning kitchen and bathroom tile, non-skid surfaces on a boat, and vinyl convertible tops. 5 inches.