The thing is, your bowel is like a good ol' compost heap, with bacteria that do good things and keep your waste processing on down the road till you expel it. If you wash 'em all oout, then opportunistic and not necessarily good bacteria might move in. Don't know if you watch embarrassing bodies, but recently a dear young women had been overdoing the douching and had developed candida on a huge scale. This is the sort of infection you risk by paying a stranger play whale music, burn a joss stick and shove a hose where it ain't intended.
If you think you're bunged up you've got the laxatives option, or get som glycerine suppositories - way cheaper than the hose, and also evaluate your diet including a good intake of water.
You can find some terrifying lies told about the benefits of hose-jobs, and these pills that claim to rid you of 'parasites' to make you thinner - lies all lies and bad for you as well.