It takes time to get used to using one. I have a 2" prochem. It looked to be the best quality. I like it, but wish I had gone with a 1.5 inch. Much quicker than using an upholstery tool. Get a glide for it.
PMF 30", swivel head ergonomic stair tool (closed spray). It is a single jet and the head flips around to easily clean the risers. Part number S1540SVC - 500psi brass valve.
Been using one for more than a decade and wouldn't consider anything else.