I do them once every three months depending on how well I have been eating and my mental state during that period. If I have been eating well, taking time for myself and am not under stress I will do them less often.
There are lots of ways to cleanse, it really depends on your needs and life style. I dont like the detoxes you just buy in the store. Its like replacing processed crap with another form of processed crap. I love juicing and cant say enough good things about it though.
If your serious about cleansing get yourself a juicer. I have both the champion and the Jack Lalanne. JL is inexpensive (as juicers go) easier to use and clean. Champion you get more juice out of but its expensive and a bitch to clean. The JL is the one I prefer right now just cause its easy.
A general cleanse… I will use a combo of organic carrots, celery (lots of Kale) Dandelion greens, Parsley, one small garlic clove (not the bulb) 1/4 of a beet, apple, grapes (hand full) and juice them then add a little flax seed. That’s just what I like though. You can get a book on foods that cleanse and create you own recipes. They have some online as well.
I make my juice in the morning and generally drink it all day. If I feel I need something solid I will only eat some raw organic nuts and seeds. That only happened the first few times I fasted. I change my juice recipe a little each day but not drastically. I will do this from about 3 to 5 days. I suggest since your new to this you start slow on on a day your home and not at work.
If you dont want to buy the juicer you can just eat the organic fruits and veggies. Stay away from everything processed. No alcohol caffeine junk food etc etc. You want what you ingest as close to its natural state as possible.
The master cleanse is good to but I just felt it was rather stringent and unnecessary to achieve a cleanse. It doesn’t nourish your body while cleaning it only strips it of toxins.
When I am not doing a actual detox I will still juice but usually only a few times a week with different recipes I like that help with my life style at the moment or whatever’s ailing me.
For instance in the winter I like…
1 apple, 1 carrot, 1 small beet with the greens, Some Kale, 1 small cayenne pepper and I grate some fresh ginger in there. Yummy. This is a warming drink that balances you and helps your immune system.
Word about beets >>>>> You will pee red so prepare yourself LOL I generally dont like beets but in a juice with at least one sweet fruit or carrots which are sweet I love it. Who new LOL Its important to try it before you say I dont like it.
Now that takes care of the body, How about your mind and spirit ? Dont forget those.
The same week of the fast I will take lots of sea salt baths.
I also go out in nature connect with the earth and get dirty. Maybe hug a tree or two LOL. I meditate and journal more, balance my chakras. Reevaluate my thoughts and goals, read more, De clutter my head. I like to swim or just float around in the ocean preferably naked but I cant do that all the time and I have a secret fear of Sharks and jellyfish so someone has to go with me 
Well its not a secret anymore LOL
Even de-cluttering your living space has a amazing effect on how you feel. I do that every few months as well.
There are loads of ways to take care of the mind and spirit you just have to make time to do it.
Oh one more thing for body >>> Long time ago we talked about oil pulling here on the forum and it really works. I have no ideal why it just does. I have everyone at the PO doing it LOL
Edit to add… Oh and herbal teas, I can go on about those for days. I use those to help maintain health and flush toxins.
Tisha