The activity of amylase is accelerated by the presence of small quantities of neutral salts, especially by sodium chloride and disodium phosphate.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
FALK, K. G., MCGUIRE, G., and BLOUNT, E.: The Oxidase, Peroxidase, Catalase and Amylase of fresh and dehydrated vegetables, Jour.
"Scurvy Past and Present" by Alfred Fabian Hess
Spit-Up Flush with cool water, then apply a detergent or an all-purpose stain remover with enzymes directly to the stain (look for proteases, amylases, lipases, or cellulases in the ingredient list).