It's all about balancing suction and airflow, experiment with different settings and you
will find a variety of settings for various fabrics.
You must have heard all the arguments about VO and AO machines.
CFR handtools allow you the best of both worlds. Get it set just right for the fabric
you are cleaning, and it will almost leave it dry. Vary the pressure also, i clean anywhere from
150 psi up to 300 psi, dependant on fabric and soiling, with the vents anywhere from closed, usually up to maximum
of 2 open. Most common half or one.