No flavor, no scent that I know of!?...Easy to use: I used "Scalding Hot Water" (The instructions say Warm water. But, this is the first time cleaning it in 2 years! I know Gross!!!...) all the way to the top. Dropped a cleaning tablet in my Hydroflask (40oz.)And, waited about 90-120 minutes (Because I forgot about it...) Dumped a little bit out. And, vigorously shook my Hydroflask for about a minute or so.Dumped out the dirty cleaning water. Rinsed it with hot water. Cleaned the inside with my Hydroflask type cleaning brush. Rotated the Hydroflask a couple of times and, I made sure to get the bottom as well. (Vigorously...) Even the curved lip inside of the Hydroflask was "Squeaky Clean". I could see my eye at the bottom Clearly!... LOL!Does exactly as it says!! Wow!! I have been struggling for years to clean my Contigo mug. It is a big one 20 plus ounces or so. Tried baking soda and water but can't get down to bottom without using a variety of items (knife etc) as my hand would'nt get down that far. Even used the caustic stuff I use to clean the Keurig machine but wasn't thrilled as it is costly. Have also replaced the mug when it go to gross. I drink tea all day long and I love the contigo mugs as they keep the drink hot for hours. Anyway, got this yesterday and immediatly put it to use. One tablet went into the mug with hot water. Another tablet went into a deep soup bowl and I placed the lid in it and weighed it down. 15 minutes later the mug was TOTALLY clean, just dumped solution and washed mug in hot soapy water and let it dry. THe lid needed a bit more time but the gunk that came out of the lid was amazing. I did bang the lid a few time on the sink edge as I noticed lots of gunk came out that way too. Put it back in solution for another 15 or so minutes and it was finally clean. I am now going to order the larger bag as this is what I have been looking for!!! Don't hesitate if you want to get coffee or tea stains from the insulated mugs, works like magic. Another plus Made in the USA!!WOW. I have purchased a couple SHARK TANK items but to date, THIS IS BY FAR MY FAVORITE ITEM!! I have used this for so many things, but the most memorable is using it for the common coffee mug and lid I use daily. I generally find myself buying a new travel mug after 1-2 years. I try my best to clean it, have tried water/vinegar solutions, baking soda solutions (won't try bleach in my drinking vat,) taking the lid and meticulously taking a slim-scrub brush and butter utensil to get into the hard to reach lid areas, but NOTHING.... and I repeat NOTHING GAVE ME THE CLEASING SATISFACTION of Bottle Bright. I soaked my items and when I watched the sludge just drain out after the first cleaning, I was SHOCKED and hooked! WOW, was that what I was drinking? Totally, amazing!I've since used it in my actual coffee maker, because at times I re-pour my half-day old coffee back into the machine so it can warm the whole canister back up to HOT-HOT-HOT.Call me silly but my Thermal Coffee Carafe has tons of hard-water spots. I soaked the whole Carafe in a larger bin and WALA - kinda like new.I love this product and I will say out of the couple SHARK TANK items I have purchased, thusfar.... this is my FAVORITE!I've purchased this before to help combat the weird smell that is left behind after I finish a protein shake and found it worked pretty well but then, so did letting it sit with dish soap for a little while. After seeing someone else used this for their coffee pot, I thought I'd get it again and try it with a pot we have with a lot of discoloration that we just could not get out.One overnight sit with a tablet and hot water removed it all with no scrubbing! I will definitely be keeping some of these tablets on hand for future use.Awesome product. I used this on my Yeti 32oz Tumblr. I have drank coffee (black) out of this cup for the last two years so I was doubtful that this product would work well on my cup due to heavy stains. I tried to scrub my cup with soap (Dawn) and hot water prior to this test (picture are after scrubbing and soaking overnight). I filled my cup with hot water and 1 tablet and let it sit overnight. In the morning I was surprised when I rinsed it out it was super clean. I only used a paper towel to wipe it out. My lid was still stained but that is an affordable replacement.This product is amazing! First, tried it out on a cup that wasnt THAT dirty, and it worked wonders and I was amazed. Then, tried it out on a coworkers mug which was the nastiest thing I had ever seen (mug hadn't been cleaned/used in at least a year). Popped the tablet in with hot water and let set for 30-40 minutes (max time is 30, but it was so nasty, gave alittle more time to be safe), and as you can see from these photos, this product is worth every reasonably priced penny paid! The after result didnt even require an ounce of scrubbing.... will purchase again!!I was super skeptical that anything could save my coffee carafe from the black film that had developed in it over the course of 3 years. I tried to no avail scrubbing, rinsing in hot water, vinegar, all the tricks I could think of... it wasn't until I found these tabs that my coffee carafe now shines BRIGHT and shiny silver inside. It's brand new!! I now use these on the regular to keep the carafe clean with no scrubbing needed. SO glad I came across these.I have kept a Strauss Creamery heavy cream bottle (16ozs) instead of recycling it in order to save smaller amounts of milk when the half-gal bottles are almost empty. (Those I return to the coop where I get them.) At some point I left milk in it and it went bad, I dumped the milk but dishwasher, brushes, nothing could remove a residual ring. Nothing.I bought these as a last deperate effort. I did as suggested for stubborn stains, used hot water and left it to soak in bottle overnight. In the am, perfectly clean. I have some antique bottles that are cloudy. Might try it in them, too. Very happy. No, thrilled.