Its works decent, but it smell awful.
Its has a noticeable effects on hard water stains even if it doesn't clear it 100%. Its alittle bit pricey, I don't know how much this chemical costs to manufacture, but $20 feels like alot for a cleaning agent. Biggest complaint is how bad this product smells. It might be intentional to warn of inhaling too much, in which case it does the job.
Rating: 4 stars