Glass beads are fairly durable but they do need to be cleaned when they get dirty. When you wear glass beads they can get dirt build up that will make the beads look less lustrous. Sweat and dirt accumulate and it should be cleaned off every once in awhile. If your beads are not in a container and they are out on display they can collect dust that should be cleaned off.
Cleaning glass beads is simple and won't take up much of your time. You can some glass cleaner like the kind you wash your windows with in a spray bottle. Spray a few of the glass beads at a time and take a soft absorbent cloth like a cotton towel and wipe the glass cleaner off of the glass beads. Keep spraying glass cleaner on just a few of the beads at a time until all the glass beads are clean and polished.
Another way you can clean glass beads is to soak the glass beads in a container that has water and a little ammonia in it. Let the glass beads soak for awhile and then take the glass beads out of the ammonia water. Rinse the glass beads off in clear water and then wipe them dry with a clean absorbent cloth until they are dry. Soaking glass beads in ammonia won't hurt the glass beads but it might damage the string that the glass beads are on. If you think that the string that your glass beads are on will be damaged don't use the ammonia soaking method.
You can soak the glass beads in very hot water with a small amount of dish soap in it. Soak the beads for about an hour then take the beads out of the soapy water and rinse them in clear water. Dry the glass beads with t soft absorbent cloth.
Another way to clean glass beads is with some rubbing alcohol. Soak a small piece of cloth in some rubbing alcohol and rub the sloth onto the beads until the beads and clean and shiny. You may have to rub the glass beads a few times to get them clean with rubbing alcohol.
Keep your beads clean and they will look nice while you wear them. You can clean any glass beads even beads that are sewn on a cloth. Beads can collect dirt and dust that need to be cleaned once in a while.