This one should be pretty obvious, but you still see a lot of forms out there with them. Offering your users an easy option to clear fields that they’ve already completed just doesn’t make a lot of sense when you’re trying to get people to complete the form fields. Stop making it easy for users to change their minds about whether or not to provide their information! Yes, there may be a case or two out there where someone might argue that providing this option helped them improve the quality of their leads or the accuracy of their database information because they were auto populating the fields, but in most cases it’s just plain not going to get you more lead conversions.