How to clean a chandelier on a high ceiling
Find a ladder that will allow you to easily reach the chandelier. First, use a duster to dust your chandelier. Next, use a spray bottle with water and a bit of dish soap to spray and wipe down the chandelier.
If you’re unable or unwilling to take the chandelier down, this is as much cleaning as you’ll be able to do, but in most cases, this should be plenty.
Source: do it yourself
Image from chinesedic