When you are not happy with what you are doing (anywhere in life) then it's time to try something different - instead of repeating the same actions over and over but expecting different results.
Google this
Why do I have a pink ring in my toilet?
However, the pink ring that develops at the water line in the toilet, around drains, in the tub/shower area, and in bathroom drinking cups is actually caused by an airborne bacteria known as Serratia Marcescens. The airborne bacteria thrives in moist environments, which is why it is commonly found in some bathrooms.
or this
What is the pink stuff in the shower?
The reddish-pink residue in your bathrooms, on shower stalls, tubs, tile, toilets, sinks and toothbrush holders is caused by the growth of an airborne bacterium called Serratia marcescens. Yes, that's right, you've got bathroom mold.
Then google
Serratia Marcescens
Then keep doing the same things over and over or not. It's your time, it's your life, it's your slime.
IF you are gonna clean your humidifier, try rinsing with distilled, try not leaving it out to dry - see if things change or not. It's gonna get wet again in a matter of hours or minutes.
What have you got to loose?
