I just wanted to give a tip on cleaning out a burnt tasting carto.
Try sticking a pipe cleaner into both ends of the carto but be careful when pulling the pipe cleaner out, you might dislodge the atomizer and ruin the carto. I clean my cartos like this all the time and I'm surprised to see how black the tip of the pipe cleaner is when I pull it out but after I do this, the burnt taste is gone and the hit is much smoother with a lot of vapor production.
Try sticking a pipe cleaner into both ends of the carto but be careful when pulling the pipe cleaner out, you might dislodge the atomizer and ruin the carto. I clean my cartos like this all the time and I'm surprised to see how black the tip of the pipe cleaner is when I pull it out but after I do this, the burnt taste is gone and the hit is much smoother with a lot of vapor production.