What hair products straighten hair i.e. types of shampoo.....but not hot rods?

Try Herbal Essence Dangerously StraightWhat hair products straighten hair i.e. types of shampoo.....but not hot rods?
An Italian Lady friend of mine used to rinse her hair in beer , to make it straight .What hair products straighten hair i.e. types of shampoo.....but not hot rods?
Try hairipy.