Back in February of '11 I started a thread about this.
Basically, I too was not comfortable with just rinsing out my Fleshlights, I found out that Climax Burst
toy cleaner had similar ingredients and the testing began. Flash forward to the present and I still use Climax on all my Fleshlights with no problems to be seen. About the only difference I have noticed is the the material becomes sticky, more so that just rinsing with water. Kind of makes sense though since the material is truly clean. Nothing a bit of cornstarch can't fix.
Fleshlight also talks about Isopropyl Alcohol as an alternative. Many guys have had good luck with that.