Good question. Kano is an interesting place - talk about terrible marketing and distribution - good products though. I contacted them - well I tried to contact them about being a distributor and they wouldn't have anything to do with me. Not in stores, not at distributors, not MLM - just one point sales.
I have used the external engine cleaner - works great! Spray on solvent type - cuts everything, including undercoat like butter.
I have even used the belt dressing. NO good. (as most of these type products are - just align the pulleys and replace the belt)
I have not tried the internal engine cleaner. Looks like a solvent based product - don't have a dirty engine to clean right now.