I use my 1000ml nalgene bottle 4 times a week. From friday until monday it just sits on my counter top. The other day I noticed a few black dots inside. As soon as I’m done using the bottle it gets washed out with water and I shake it a few times to get any residual water left inside. The problem is that the bottle seems to accumulate small droplets which is where the mold or mildew is forming.
The opening is very small making it virtually impossible to get a paper towel in there to dry it. Is there any type of cleaner that should be used? I tried flipping the bottle upside down on a paper towel, but it didn’t solve the problem