The hose end foam cannon from chemical guys is a huge waste. It does not shoot any more foam on my truck then just using a bucket with wal-mart car soap.
Was VERY disappointing....I guess you have to have the pressure washer version to really get the thick foam.
Foam cannons also use a crap ton of high dollar soap as well. I noticed it would take almost two mixing bottles full to soap down my crew cab dodge.
Interesting, I can wash either my QCSB or QCLB with just one bottle each and the mixing valve on the highest foam setting.
Are you using the specified soap at the recommended dilution?