Wet-dry vacuum cleaners are best suited to garages and unfinished basements since they tend to spew fine dust out with the exhaust air if you don’t install an optional filter. They can come in handy for limited jobs in the home, such as clearing out a clogged sink, sucking up pet accidents, etc. Verify that the nozzle is clean before putting it against carpeting or upholstery to avoid transferring even more soil onto the surface.
In some upholstery situations, you may need to cover the nozzle with an old nylon, secured with a rubber band, to prevent fabric stretching or distortion.
Vacuum filtration is an important topic that is covered separately.