Using Releasit Encapsulating Detergent and Fiber Plus Pads under my US Products furniture and stair roto. Cleaning a stair carpet made of a wool oriental rug runner.
Using an electric Multi-sprayer, I sprayed the stairs with Releasit Encapsulating Detergent, and the pad, then run the roto over the dampened carpet.

pic01 Shows how I do the stair riser.

pic02 Shows doing the step.

pic03 Shows the finished job. Turned out just fine.

pic04 Shows the clean side of the Fiber Plus Pad.

pic05 Shows the dirty side of the same pad after cleaning the stairs.