BestAir RPS-1C-1/PACK 1C HumidiClean Extra Strength Humidifier Cleaner, Single Pack, 32 Fl Oz (Pack of 1), Blue

You have let it sit overnight, but there is no scrubbing. Comes right off with a toothbrush m

I have a warm mist humidifier (the Vicks UV with 2 water containers, similar to my previous Slant Fin humidifier), and this cleaner is extremely effective. Rather than filling the heating compartment five or six times with vinegar when I clean it once a week (after removing the mineral absorption pad), I can fill the compartment once for a matter of a few minutes and all the hard water residue is gone. My water may be harder than yours.Unfortunately, the instructions on the bottle say that the product should not be discarded in the sink; it should only be discarded in the toilet. This turns out to be virtually impossible to do. The sink in my bathroom is too small to rinse out the humidifier, so I have to rinse it in the kitchen sink. The warning is not specific enough to tell me what the danger is for putting it down the sink. Does it harm the tadpoles in the sewer, or what? My solution is to run the water in the sink for three or four minutes to minimize whatever the potential is. So I am left to wonder if I'm doing damage to my plumbing. I'm giving only five stars for effectiveness minus one star for uncertainty.

I don't use this product to clean a humidifier but as a cleaning product. It takes hard water off of any surface like you would not believe. I sprinkle a little of this on on get some on a toothbrush. It bubbles and just eats away the hard water. You can then rub it with the toothbrush and it will general vanish.Love this stuff, I've been using it to clean sinks, tubs, toilets, etc for many years.C MeyersOgden, Ut

Instruction is not very clear. It says "Use plastic brush to apply", but it does not work that way. You must immerse whole unit with this chemical for a couple of hours to get a good result. Calcium deposit/scale is very tough to remove. I used almost one third of the bottle for cleaning one humidifier. I need to repeat it regularly.

I have a humidifier that has a clear plastic basin that holds the water. Lately it's been getting this weird cloudy hard film that won't scrub off. I just poured this stuff into it and the filmy cloudy hard water buildup vanished. I did take a toothbrush to a few of the hard to reach areas, but with just a couple of passes, the residue was gone. You do have to be careful not to spill it on anything or let it sit too long because it can stain. I did spill some in my tub and sink but I rinsed it right away and it was not a problem. But later I found one little tiny dot that I must have missed and it's stained - very lightly though

works well

I am admittedly BAD about cleaning humidifiers, but after seeing the gunk that builds up I bought this. It did a great job cleaning up even the worst of the mess. Now I'm ready for the winter season again.

I have hard water deposits that are difficult to remove. I tried two other cleaners that did not work. This one was great! My humidifier has not been this clean since I bought it and I did not have to scrub it to death.

It marked aluminum surface