My Dad is 7 months post treatment now and although the mucus issue is nothing like it was; it's still annoying for him.
He tried the syrups with Guaifensin and then recently switched to Mucinex which he feels helps. (Had to get a friend to buy it in the US, they don't sell them here in Canada).
The humidifier helps. Some say avoid dairy products (which he's trying to do now). They also say drink lots of water. Before treatment my Dad was a big water drinker, now he finds water hard to handle.
The dr's never told us about a suction machine; only read about it hear. You would think they'd suggest it to help during treatment; boy getting up that thick mucus isn't easy as you all know too well.
Take care,