Ask them about their lives, find the things that are fucked in their life and relate it to how the rich are stealing from them. Don’t try to sell them communism itself as you’ll hit a brick wall, agitate around the exploitation in their lives, find things to empaphise with them on, find the broken things in their world and agree with them how messed up those things are. Relate those broken things to the enemy.

Oh don't get me wrong, I'm absolutely not saying suggest solutions. I find a good approach here is to hear their problem then respond with "that reminds me of" an experience either yourself or "a friend" has had, tell that story. Then you use that story to direct aggression and blame towards the class enemy. This then isn't going to be taken as "you know nothing about me" or come up against personal walls people put up around their lives. It's about you or someone else but in context of conversation people link it to themselves by way of how it flowed there. When I've been salting this has been a common interaction I've had around workplaces, someone says a problem they have then some other worker is reminded of their problem or a friends problem and blames that problem on migrants or something -- the original person then relates the blame on migrants to their problem themselves. It never hits any walls in this way and this seems to be how these trends spread through the workforce.

Much of my work salting has used this tactic to agitate a workforce into anger at managers and owners. Agitating in this way is half of the battle.