What customers say about Green Piece® glass cleaner. Every review below is quoted word for word from a Verified Purchase review on Amazon.com (captured October 24, 2026). We left reviewer names off and did not edit spelling or wording.
On Amazon, the Green Piece® Glass Cleaner 16 oz is rated 4.3 out of 5 stars from 1,618 global ratings (as of October 24, 2026). See it on Amazon.
Soaking and deep cleaning
“This stuff works amazingly well for getting the tar and grime out of your glass pieces. I soak mine overnight in a plastic baggie. When I open it, I only really need to run the piece under hot water for a few minutes. Sometimes I use a toothpick to really get under in the deep crevices but this stuff makes it very easy.”
5 stars, 16 oz, August 17, 2026
“This stuff cleans so well that I don’t even have to use brushes and pipe cleaners anymore. It cleans the pieces I could never get fully clean and keeps the glass looking and performing like new. Great for intricate pieces like ufo percs, shower head percs and ash filters”
5 stars, 36 oz, September 15, 2026
“I let my glass item soak overnight in the bag that comes with the cleaner. The liquid gets very dirty, but there’s no need to change it out for fresh. The cleaner dissolved nearly all the built-up, grimy residue, leaving me with a few chunks to scoop out. Since cleaning glass is now an easy chore, not the unsafe operation it used to be, I won’t wait so long.”
5 stars, 16 oz, September 13, 2026
“Good product for clean glass, be prepared to let the item soak for a few hours.”
4 stars, 36 oz, June 14, 2024
Reusing the cleaner
“The gunk comes right off after letting it sit overnight. I’ve reused it too and it never disappoints.”
5 stars, 36 oz, December 20, 2022
“Works great. I use it several times, getting rid of the dirt before putting back in the bottle. Plus the brushes they give you are awesome! Great product”
5 stars, 2 x 16 oz with brushes, January 9, 2026
“Had a 2 chambered glass bubbler that was completely clogged. I filled it with half a bottle, swished it around a couple times, then went and ate dinner. A couple hours later, after a couple more swishes, I poured it back into the container, strained thru a paper towel. Rinsed it completely with very warm water, and this thing is brand new. Not a spec of tar, works like it did when new. I have since used the same bottle on two hand pipes with perfect results. In fact it works so well, I didn’t even take the brushes out of the packages. My only regret is not taking a picture before hand to post here. Amazing.”
5 stars, 2 x 16 oz with brushes, April 21, 2018
Smell, taste and residue
“This works wonders and doesn’t leave a bad taste or smell behind when you’re done cleaning it. It’s super easy to use and does exactly what you need! The magnetic scrubbers are easy to use and relatively effective for removing stubborn bits of residue.”
5 stars, 2 x 16 oz with magnet scrubber, June 21, 2026
“Just got this today & tried it out. It’s my new cleaner. I LOVE that it doesn’t leave a film in my sink or my house stinking for the next few hours. Love that I could clean right in the bag it came in. I just did a quick shake & I think it did pretty well. I usually soak mine, so I don’t mind. Also love the eco-friendly ingredients & packaging.”
5 stars, 36 oz, May 27, 2026
“Works amazingly, just use lots of water and a bit of this and ur good to go. Doesn’t leave a smell or taste. One bottle lasts forever as well. When it sits the ingredients separate but give it a few shakes and it’s all good. Will definitely buy more when I run out.”
4 stars, 16 oz, March 18, 2020
“Does What It’s Meant To Do. No Chemical Smell. I’m Happy”
5 stars, 2 x 16 oz with brushes, March 15, 2024
Quick takes
“This works amazing and fast! I love the ease of it and the smell. Would definitely recommend and buy again. 10/10”
5 stars, 2 x 16 oz with magnet scrubber, August 14, 2025
“This product works faster and better than any product I’ve used, especially better than rubbing alcohol. Would definitely recommend it.”
5 stars, 36 oz, August 14, 2026
“10/10! My piece was straight up BLACK and grimy because I always forget to clean it. There was so much build up I didn’t think it’d ever come off. After letting it soak for over an hour it’s as good as new!”
5 stars, 16 oz, December 24, 2025