Well they don't say what is in the stripper. If it were me I wouldn't buy it. I'm a professional furniture refinisher. The stripper looks so mild I think it would take forever to get the paint off. They boast about not having methylene chloride in it but that is exactly what I would look for. The best retail remover I've used is Kleen Strip. It's available at walmart for less than 20.00 a gallon. A better remover if you didn't mind the hasmat fees in shipping is Kwick Kleen #145 remover. It's about 90.00 for 5 gal. You would also need stripping gloves that go up to your elbow. The stuff is really hot.
The power washer whether using it with hot or cold water is a good idea. It will get paint out of corners you could never get otherwise.