As of August 2015, good resources for crocheting nylon scrubbies are websites for Maggie's Crochet, Mother Earth News and IndieOnline. Maggie's Crochet presents standard crochet instructions using abbreviations. Videos demonstrate how to make scrubbies for both right- or left-handed individuals.
Mother Earth News has beginner's directions for making both large and small nylon scrubbies. Detailed instructions for each row use no abbreviations. The comprehensive plans describe how to cut the fabric as well.
IndieOnline's resource comes from Heloise Hints. There are two sets of instructions; one offers an overview for crocheting a scrubbie, while the other describes how to assemble a scrubbie with a few quick sewing stitches.