Vases may be dishwasher-safe, but most of the time, it’s best to wash your vase by hand.
Use dish soap and water and wash it like a wine glass or other delicate glassware. Especially if the vase is made of glass, it is recommended to rinse well and wipe dry to avoid water spots. By changing the water every day, you will prolong the life of your bouquet, as well as prevent the vase from becoming sludgy and stinky due to the accumulation of green sludge. However, if you wait too long, it is possible to remove stubborn gunk by immersing the vase in warm water and dish soap.