I performed a 10-month study comparing their abrasiveness the
effectiveness of tarnish control between 3M's Tarni-Shield Silver
Polish and Blitz Silver Polish. The results were identical - they are
both the least abrasive and provide the best protection among all
commercial silver polishes. I personally prefer the Blitz because if
you have no available water or are working on silver with attached
porous materials, this is the polish to use.
The Tarn-Shield requires rinsing. Another plus is that Blitz is
cheaper. If you do purchase Blitz, I would transfer it to a container
with a self-cleaning spout or simply unscrew the top. The top the
company provides clogs quickly.