Wilhelm says sanitising products aren't just used as promotional giveaways.

威尔汉姆提到，人们不光把清洁产品用作促销赠品。

Sales of all logoed sanitising products surged in early spring, and again in September, at the start of flu season, Wilhelm said.

带标志的所有清洁产品的销售额在早春时节猛增，继而也在流感季开始的九月激增，威尔汉姆表示。