Solid product
If I had to guess, I'd say this is Naphtha/lighter fluid. That was a staple in the recording/engineering industry forever for cleaning the tape path. They say to use this on the rubber parts too like pinch rollers. I'm not sure I'm onboard with that, but it's more benign than some of the other solvents out there. This stuff is expensive and it's hard to beat denatured alcohol on the tape path. If you read online all the recommendations on what to use for your tape path, your eyes will bleed eventually.  This is a good product, but don't think it's the end-all solution for the price.
Rating: 4 stars