These are fantastic bubbles that could stick to your hand, and even stick on other surfaces for long periods of time! My clients with autism are absolutely obsessed with these bubbles & mand for them all the time!!! When they pop, there’s a slightly sticky residue that it leaves, but honestly I don’t even want to say “sticky” because it’s really not bad. It reminds me of glue, but is a quick dry and not super sticky. It’s like the little film you could peel off your hand when you get glue stuck to it. But again, not hard to clean up, crumbles rights off your hand and surfaces. I haven’t had any staining issues at all so far. It is a really sticky, thick solution, so have a napkin or paper towel in your hand I case it drips. I’ve found that the most effective way to use them is to scrape off the excess and blow lots of little bubbles (which it does a lot!!!). I’ve been able to get some big bubbles out, but because the solution is so thick, they don’t last long. However, when you blow lots of smaller bubbles, they are perfect for stacking on your fingers & they literally will stick on anything and float around for so long!!! When I was blowing them in the house, they stayed on the curtains for AT LEAST 45 minutes, it was insanely awesome!!! There was some leaking in the container, but the container is plastic so I wasn’t worried about it. And I wouldn’t be surprised if that dripping was from how they’re filled when they’re made because I couldn’t imagine the procedure for filling them... probably a huge sticky mess! Anyway, it gets a little harder to blow them when there’s not a lot of solution left. I’ll keep dunking it and no bubbles will blow. But I noticed if you get a lot of solution on it when it’s toward the bottom, it blows better. I don’t know... overall, I’d say it’s an awesome product, my kids love them, and they were well worth the money for me!