I love yerba and tried to taste a new one for me - chimarrao (Brazilian yerba, very fine, nearly flour). Having looked at some videos, I tried teabags on bombilla, preparing it properly and tapping on it slightly before I pour hot water. But.. nothing helps. Very difficult to sip.
From soil physics, I understand that the cause isn't that the straw (bombilla) gets clogged with yerba fine particles, but probably because drinking yerba is a process of seeping through the wet environment. The finer the particles are, the more difficult it is to seep.
So the only way is stirring it, but if you stir it, particles come to your mouth with water. That's not good. Also stirring and disrupting the continuity of the yerba environment is prohibited.
Who knows the truth and the way? Any Brazilians here maybe?