Just toss the flowers in a gallon-sized zip-lock bag along with about a cup of salt. Shake the bag well, and the salt will whisk away the dust and debris.
把花束放在有一个加仑容积大小的袋子里，装上一杯子盐，扎口摇一摇，盐就会把花瓣上的浮尘和碎片带走。
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To speed things along, make sure to stash your zip-top plastic bag in an accessible place so you can easily take it out of your baggage and put it in a bin during screening.