I used Hoppes #9 almost exclusively for cleaning when I shot BPCRS competitively. It worked very well in those barrels requiring brass chambers to contain the powder. At that time, 15 years ago and earlier, I was buying #9 in quart GLASS jars. I suspect that they've modified the contents again, because all of the new stuff is in plastic bottles.
The subject of the plastic had me a little curious, so when presented with the opportunity to purchase several small bottles in glass at a gunshow, I did. Some of the boxes were yellow, and others orange, so different vintages. The oldest was pre-zipcode, so 50+ years old. THAT oldest bottle had a slightly different aroma than any of the others in glass bottles. I suspect benzene was still present, and is one of the things missing from the current formula.
Hoppes #9Plus is the BP cleaner and lube. I ahven't seen it for sale locally for quite some time, but I had used it many years ago in frontstuffers and it worked well.