Investors might want to bet on Ecolab (ECL) , as earnings estimates for this company have been showing solid improvement lately. The stock has already gained solid short-term price momentum, and this trend might continue with its still improving earnings outlook.Analysts' growing optimism on the earnings prospects of this cleaning, food-safety and pest-control services company is driving estimates higher, which should get reflected in its stock price. After all, empirical research shows a strong correlation ...