What is the problem you think will be resolved by cleaning the sensors? Movement related is the encoders.
Doing a search on Power Quilter Sensor, brought me to a free PDF of the owner's manual if you don't have your's handy. LOL I spent so much time with that manual back in the day, it was funny to see it again. We never could get a decent bobbin no matter what we did so started buying prewound but short form is I spent many hours with that manual...
https://montavilla-sewing.files.svdc...ion-Manual.pdf
Starting on page 24 there are a mentions of a Motor and other Sensor tests. Maybe what you are wanting is in there?