you need to use the small round suds nozzel, this will create a fine foam, spray the foam into a basin, the use the upholstry brush to apply to the stairs or chair.
the surge is caused by a faultering armture, might be caused by low carbons or sticking carbons, strip the motor down for inspection. Or take it to your local kirby service centre shop for clean and service and polish. price range from 39 to 59
You either have a clog, a damaged fan, orsomething is wrong with the motor ( not as likely ) . Best thing to do is take it to your local vac shop for assessment.
