They have it right. An automatic pistol needs to be cleaned very regularly. The worse the weather the more often the need for cleaning. Some types of ammo are worse than others as far as deposits.
Look on line there are instructions on completely dis-assembling your gun for cleaning. Just Google the brand and model. Youtube has videos too.
I have a CCP. The pistol I carry gets cleaned weekly even if I do not fire it. You would be surprised at the crap that gets in it just carrying it around in a dirty/dusty environment.
You do not want to have a gun that jams when you really need it. If it jams it is nothing but a small club.