@lesley56 There is very little science or pure research to support the concept of "cleansing" or "detoxifying" - your body is actually very good at doing this.
Here is what the University of Pennsylvania Medical Center has to say:
https://share.upmc.com/2021/08/do-detoxes-work/
And the University of California, Davis - which has an extensive nutrition and diet graduate program:
https://escholarship.org/uc/item/63j447k7
Remember, the advertised "quick fix" methods that involve specific beverages or supplements are NOT regulated by the FDA, so it is "buyer beware.

If you want to do this on your own, the most healthful way is to find a healthy, vitamin and nutrient dense eating plan that works for you, drink plenty of water, avoid alcohol, caffeine, tobacco and get plenty of rest and exercise. This will allow your body to mend itself.

For example, I have a number of medical conditions, with medications that can create havoc with my digestive system, and occasionally my whole body is "out of sorts." Then we go to a full-time Mediterranean diet (we always follow a modified version) with no red meat, fresh fruits and veggies (or fresh frozen ones with no sauces if out of season), eliminate our cocktail/wine with dinner and concentrate on drinking more water for a few weeks. We also limit refined carbs, eat lots of lentils and beans, wild rice and live-culture yogurt. Our treat is a daily piece of really dark chocolate.

What are you thinking you need to improve to feel better?