I tried to use the Behr stripper and I found it to be absolute garbage! I tried it, let it sit for a few minutes, scrubbed the hell out of it with a coarse brush, then rinsed, repeated, time and time again. It still didn't work. I tried later with a pressure washer and the stripper etc. Still ****!
I then rented a big drum sander and voila, done all in less than an hour with no effort. The sander worked beautifully!
The only downside, according to the kid at home depot, is that when you sand the wood, it closes up the pores and when I re-apply stain/paint, apparently it may not penetrate as well as it should.