I'm doing the pineapple cleanse too! Today is my first day and my husband's second day. This is his first major dabble into natural remedies, after watching me for almost 3 years, so I'm kind of excited for him too.
Anyway, this is a good question and I'm interested in finding out the answer. I think it depends on what you have as some parasites are visible to the naked eye and some are not.
Some people have white rice things and others have tomato-skin stuff, etc. However, I know nothing about how to find out if the really tiny/microscopic things are out.