Industrial cleaning equipment maker Tennant Company (NYSE: TNC) reported fiscal first-quarter 2018 earnings this morning, sending its stock up 9.7% as of 11:25 a.m. EDT.Tennant reported earning $0.18 per share on sales of $272.8 million, easily beating consensus expectations for earnings of $0.15 and sales of $251.9 million, and helping the company to break a string of disappointing announcements that had left its stock lagging the market.Tennant Company cleaned up its act in Q1.