How to clean narrow glass floral vases of water stains ?

I use a little bleach, hot water and let it sit, then use a long handle dish brush to clean it out. Most times it works well.

you need a narrow pipe cleaner

Pouring vinegar in and placing in the microwave for a minute or so has worked for me in the past- another benefit is that you will be able to wipe the interior of your microwave clean afterwards! Two for one- not bad!

If pouring pure bleach in & letting set for a day or so doesn work, the glass has been etched and you're stuck..maybe paint the outside of the vase

Try Lime a way it works good!

What would you use to clean white water stains inside a decanter?