While cat/pet bedding is made from same crushed walnut, they differ from blast media in following ways -
https://www.thehighroad.org/index.p...-thing-fa-brass-tumbler.926192/#post-12790152
In comparison, Zilla Desert Blend linked costs more ($10.90/7.5 lbs =
$1.45/lb) with possibility of containing dirt/sand/abrasive.
Brasso ingredient lists:
isopropyl alcohol 3–5%,
ammonia 5–10%,
silica (sand) powder 15–20% and
oxalic acid 0–3% -
https://en.wikipedia.org/wiki/Brasso
Brasso was formulated to remove tarnish by chemical reaction with copper and acid (Similar to adding Lemi Shine/lemon juice/citric acid to wet tumbling solution) with additional physical cleaning from fine silica/sand. While small amount of acid will just react with copper superficially, in larger amounts and over prolonged period of time, zinc could leach from copper enough to make brass brittle.
NuFinish "polymer" liquid polish is made from zinc cross-linking polymer emulsions and does not chemically remove tarnish (surface corrosion) from brass surface. And NuFinish does not contain wax that can be removed from brass surface rather create long-lasting polymer layer on brass surface that can help with resizing and prevent tarnishing for years (Why water beads on car paint surface even after several car washes or rain water on my car after a year) -
https://nufinish.com/faq/
Also, Brasso and rouge contain fine abrasives (NuFinish liquid polish does not) and I would not want to scratch my die surfaces with any residual abrasives on brass -
https://benchmarkabrasives.com/blogs/news/what-is-a-jewelers-rouge-and-color-chart
FYI, "... Best Way To Clean Brass?" article from Shooting Sports USA -
https://www.ssusa.org/content/what-s-the-best-way-to-clean-brass/