It does it's job, it cleans your products but i'm not feeling it. Getting it into the hole is simple like any other but i've found half of it immediately comes back out, maybe because it immediately comes out as a sort of foam. Haven't had this problem before(tested on multiple onaholes) and it seems to leave behind little bits of fluff or something which definitely weren't there before, guessing it was part of the cleaning product that dried up. It does seem to clean the products though so it wasn't a total waste but i could only recommend this if you had no other choice.
I've been using this for ages and I always get more. The solution isn't too concentrated and doesn't need a ton of water to clean off. You also don't need a lot of it to clean an onahole so it's quite economical. It's also anti-bacterial and it also has a pleasant smell to it.
I agree most of what "Just a User" said, with a bit other things to add:
It appers (from the packaging) that this bubble cleaner should be applied after washing holes with running water and dry it whatever way you want. After applying, just leave the bubbles in the hole until it dries away. In actual use it dries after about few minutes.
There's also this huge plus side if you're the type who doesn't care what's in your hand soap, or if you can't control how much soap to add.
This is a good alternative to using whatever hand soap you buy from wherever big box store your neighborhood has. Doesn't leave any smells and does a good job at removing lotion (at least onatsuyu and the such). Pretty easy to use, I just squirt some in after running some water through the hole and clean it out with a skinny brush designed for cleaning water bottle mouthpieces.
+Easier & simpler than powdered cleaners
+Doesn't leave any smells behind like regular soaps can
+Does what it's supposed to
=This stuff comes out as a foam that collects at the entrance of the hole, rather than a liquid that shoots into it
-Doesn't seem to empty /too/ quickly, but powdered cleaners are probably more economical
-Wish the cap closed differently - if you leave it open by accident, there's no clear indication until waste a bunch of it