I did the Nature's Secret Parasite cleanse originally but I'm not sure if they make it anymore. I'm using Renew Life cleansing products now and selling a ton at our health food store. I like them better because they are capsules and liquid extracts instead of hard tablets which can be harsh on the stomach when you are fasting. People are having great results. That's what my buddy took who started tripping at work. He lost about 3 inches on his waistline too. If you're bloated it's because you've got stuff packed away in there. I'm 32 years old, 5'10, 200lbs, and I have a 32 inch waist. I didn't get down that far until I started doing cleansing fasts.
As far as the colon cleanse goes you can go a few different ways. You can buy a full body detox kit like the First Cleanse from Renew Life or the Ultimate Cleanse from Nature's Secret which will do your whole body and your colon. They usually take about a month or so and you have to change your diet a bit, just follow the directions.
I like doing things the fastest and most efficient way so I came up with my own cleanse based on "The Master Cleanser" book. Your intestinal tract can't spend energy cleansing itself if it is constantly digesting and processing food which takes tons of energy. I'll fast solid food for 10-14 days, use the lemon juice/maple syrup/cayenne pepper drink in the Master Cleanser, do about 6 whey protein and water shakes a day, 3 Greens + servings, maybe fruit juice or veggie juice if I get really weak, drink tons of water, and take a cleansing kit, usually Renew Life Advanced Cleanse. I also take Garcinia Cambogia/HCA capsules and tea to stave off hunger pains. With the whey and the Greens + you can still function at work, if you did just the Master Cleanser drink you would have to take time off.
You will detox hard and fast so I hope you have some serious discipline if you do it the same way I do. Otherwise just take one of the kits and follow the directions. Generally with the kits you'll have to eat a ton of fiber, fruit, veggies, whole grains, and only fish, eggs, and protein shakes as a source of protein. Beef, chicken, lamb, goat, bisen, pork, etc... are harsher on the digestive system and take a long time to digest, especially pork. If you're going to fast you might want to do a 3 day first with just the Master Cleanser concoction, the whey protein, and the Greens + to see if you can handle fasting. I've only known a few people who have done a long fast like that without ever fasting before. BTW - Just about any health food store will have the Master Cleanser book. Take it with a grain of salt, the recipe for the cleanse drink is awesome, but he's way out there on other stuff.