I recommended fasting is the best way to cleanse your body. Normally I will cleanse 3 day in a month. But make sure when you do fasting don't just drink plain water.
Buy some organic fruit and vegetable and make to juice.
The purpose of doing fasting is to rest up your body machine(organ). If you think organic is very expensive. Some store sell already make organic juice.
Read these article about :
Longetivity through organic lifestyle.