There are a few ways to get the most foam out of your foam cannon. To get more foam you can select the best pressure washer which has a perfect PSI level for your foam cannon, you should also choose a good soap formula, ideally, one that advertises thick foam.
As well as this, to get thicker foam you should also use warm water as this is better at activating the suds into a foam.
Finally, you should rinse your car before you start using the foam cannon for the best results. If you do all of this and keep up excellent maintenance of your equipment then you will get more and thicker foam from your foam cannon which is more satisfying to see and better for cleaning your vehicle.