Pretty neat device LE. I keep damaging things with my regular pressure washer spay tips, and they make a huge mess. Ever consider spreading an epoxy coat on your garage floor? I'd be interested in watching you DIY.
Funny you should mention that. After cleaning the garage floor, I’ve been considering my options. I’m not that happy with the sealer but I’m concerned with epoxy sticking to the remaining sealer. To remove it all, I think I need to grind off the top of the slab.
I hate to say this but, I feel your pressure washer does not have enough gpm to properly operate that surface cleaner. you need more that 2.8 gpm and 2500 psi or better.