I have a Breville Cafe Roma that has not been deep cleaned since I bought it so I decided to do that. Based on videos and articles, I need some cleaning agent that could remove the coffee oil residue, which is the gunk build up inside the portafilter. I could either get the Breville original cleaning tablets which are $20 for 8, or the Cafiza which is $22 for 100, or this product which is $20 for 120. I decided ultimately to go with this one instead because it is slightly cheaper than the Cafiza.However, I must say this product listing is rather confusing. The title mentions both "cleaning" and "descaling" but these are two completely different things and requires different chemicals/products. Cleaning usually refers to removing coffee oils and residue left by the coffee. Descaling specifically refers to removing the deposit left by mineral in the water used for brewing.With that in mind, I decided to try these as "cleaning" tablet as one of the pictures suggests. I dissolved 2 tablets in a large bowl of hot water, then submerged both the portafilter and basket in the solution. I let them sit for about 15 minutes, then took it out and still see a lot of buildup. I took a brush and was only able to remove a bit of it so I put the portafilter back into the solution. After an extended soak for a couple hours, the solution still only turned a little brown, which would indicate that it was not effectively dissolving the coffee oil. When I pulled the portafilter out, I could see two things right away.1. There was still buildup gunk left on the inside of the portafilter.I again took a brush and gave it a good scrub with some cleaning solution, but nothing more was coming off no matter how long or how hard I scrubbed, even after the extended soak. In comparison, when I watched YouTube videos about cleaning portafilters, the moment the portafilter was submerged in the cleaning solution (made also using hot water but with Cafiza instead), the cleaning solution turned brown almost immediately, which would indicate the cleaning agent is effectively. Whatever that was left could be scrubbed off with a brush or even just wiped off using a towel. That never happened to my portafilter using this product. I would give it another soak had it not for the next, bigger issue.2. It turned the shiny silver surface of the portafilter into dull grey.This is a completely unexpected side effect that was not indicated on the packaging or label or the product description on the page as a warning or caution. The portion of the portafilter that was submerged in the cleaning solution turned from silver to grey. While I don't think it would affect the functionality, it is still a negative result from using this product and made the portafilter aesthetically unpleasant.So overall YMMV but based on my own experience I have some doubts about the effectiveness of this product. Moreover, it has proven to have negative effects on my equipment which is simply unacceptable for a cleaning product advertised to be compatible with the brand that I have. I would be returning this and then pay a bit more for the Cafiza which has a good, proven track record from all the reviews and videos by professionals and enthusiasts on YouTube channels and blogs.