tumbling

Hi all. Just purchased my first wet tumbler with some stainless media. Just wandered what everyone’s favourite recipe of various cleaners gives them the best results for shiny brass? I am hoping to need some sunglasses to reload! 😎

Anybody have any problems with their tumbler not 'tumbling' properly? I have tried mine with all different amounts of brass, pins and water but it never seems to get the tumbling action going properly, the brass and pins just sit at the bottom of the container as it goes round instead of up the...

As title says, anybody used (small) stainless steel nails whilst wet tumbling, any pitfalls I should think about? Thanks in advance