Ezy-Drop Guide and Eyewash Cup by Flents Eye Drop Guide Uses No wasted drops. No stressful blinking. Insert the yellow guide plug into the bottom and the Ezy-Drop Guide becomes an Eye Wash Cup. Directions Wash the Guide thoroughly with soap and warm water before use. Rinse well and dry. Remove the screw cap from the medicine bottle, remove guide plug from the eye wash cup, then thread the Ezy-Drop Guide on to the top of the bottle until snug. Use the attacWarnings To use the Ezy-Drop Guide on another eye drop bottle, be sure to wash the Guide thoroughly with soap and warm water, then thoroughly rinse the entire Guide. Use the attached cap on the Guide to replace screw cap on the eye drop bottle.