After 4 years, even a systemic pesticide would be gone from your plant.

Aloe Vera have a tough skin that is easy to wash, just like your apples, oranges, cucumbers etc. If you leave them outside in the rain most of the year then anything that was ever on them has been rinsed away. The greater concern is for scraping or cutting out those yellow veins of latex on the inside surface of the leaves while you're trying to get the gel out. That stuff can be a very powerful, even painful, laxative (but it'll sure detox your a$$ if you're worried about something you et). To remove the gel I split the leaf open lengthwise and scrape the gel out gently with a table spoon, being careful not to get into the yellow veins. I find it's easy to drink if I mix it with citrus juice. Most citrus juice, including lemonade and certainly all those so-called "sports drinks", are too acidic for my stomache so mixing in aloe juice cuts the acidity and make the aloe drinkable. I always use aloe juice when making lemonade. My Aloe-ade recipe 1/2Q (16oz) Lemon Juice 2Q (1/2Gal or 64Oz) Aloe juice 1 cup sugar 1-1/2Q (approx) water to make up to 1 Gallon Aloe/Lemonade

When watching the Doctor's, they said no one needs to do a detox, its a hype. Don't waste your time or money.

This is a great soup by Ming Tsai. Very fast to make. Short ingredient list. Delicious. He calls it super immunity soup and I swear it helps me fight off colds. Soup