When I was first getting into using toys, I used a douche. I quickly found that a single bulb of water was generally insufficient ; it would get the low-hanging, er, fruit, but too often, just as the toys were getting really busy, there'd be a new delivery from Peristalsis Express. So I tried multiple bulbfulls, several times, in an attempt to really get up there. Sometimes, this did the trick admirably; other times, I'd be lulled into a false sense of security, and again have the toy's movement suddenly slowed by a flow of sludge. Plus, multiple bulbfuls had a tendency to hold back a little—I'd think my butt was clean and dry, and slip in a plug; but take the plug out a half-hour later and a little squirt of yucky fluid hit the floor. And finally, it seemed to me that the natural mucus production was forced into overdrive after a douche—a large flow of mucus during play (not necessarily a bad thing) and also minor GI distress, with a lot of belching, because the body chemistry gets knocked out of equilibrium. (If this happens to you: bananas and strawberries have lots of potassium, which is what your body wants.)
Instead, I now rely on mechanical means. This process isn't exactly pleasant—you directly confront a lot more poop than you will with the douche method—but it works at least as well as a douche without the held-back water and mucus overproduction
After my regular BM, I start with the Tantus Ripple. First, I just leave it in place; its mere presence seems to stimulate the lower colon to squeeze a bit more into the rectum. I pump the toy back and forth a bit, then withdraw it; the Ripple's four bloops work to pull the crap out. Wipe it clean with TP, wash it off with soap and hot water, re-lube and slip it back up. One nice thing about the Ripple is that it's very smooth and gently curved; you can move it in and out quite a bit without undue irritation.
Once I'm happy with how clean the Ripple is when it comes out, I use my Beanstalk toy from Fun Factory. This is a longer, more bead-like silicone toy; its shape is even more effective at removing the stuff than the Ripple, and it reaches further, up into the bottom of the colon. I try not to use this as much, because its rougher texture and its greater reach can lead to irritation, but I don't consider myself clean until this comes out without visible clumps of brown on it.
Depending on how much assplay I want (and isn't the answer always TOO MUCH?), I very well may start all over again: slip the Ripple back in and go sit on it for a half-hour or so, then see if there's been more stuff come down the pipes. Frequently, for me, the answer is yes, but the second round of cleaning is (almost always) all it takes for hours of clean-enough-to-lick anal play. (Well, maybe not really lick...) (Maybe.)