New to decorating. Could someone please tell me how to get white corn starch dust off of my gum paste flowers? The flowers aren't very bright with the powder from the corn stach on them.

Hi welcome to CC!
I had small gumpaste flowers and I used a cotton bud dampened with vodka to clean the starch off, make sure they're fully dry and the cotton bud is just damp, you can wipe it off and the flowers won't go soggy or sticky with vodka (or any clear alcohol), for larger areas I use squares of cotton dipped in vodka and wipe.
HTH's

Thank you so much for your help.

I usually steam my gumpaste flowers, and that takes off any leftover cornstarch. To steam them, just boil a little water and hold the dried flowers in the steam (easier if they're on wires, if not be careful not to burn yourself) for a few seconds until they look dewy, then let them dry for a couple of hours.