I saw a demonstration of how this works and it's a blessing for us that don't want to make any dust. The cost is low compared to a sand blasting set up if you already have a pressure washer. I think I'm going to get one. There are various brands out there, so you can choose the quality you need. PJ
This is just one company of many. (No affiliation on my end)! Just for reference.
Wet Sandblasters for Pressure Washers
Wet sandblasting demos on Utube.