I have a Universal Rocks backdrop and ledge combo in with one snake, and a background feature rock in with another. I've attached both by screwing the fixtures into the back wall so they're flush flat against it and then going around and sealing the edges of the fixture with silicone so there are no gaps. Never have had a problem with a snake (or their mess) getting behind them.
There's no way to truly disinfect any porous surface -- Universal Rocks products, wood, non-impervious PVC, or otherwise. I just spot and deep clean the Universal Rocks stuff with Dawn, water, and a good scrub as needed. As long as the backside soft foamy bits are sealed away and you're not dealing with any nasty bugs, it's enough to keep things clean. Your normal cleaning procedure sounds like it would work just fine! Just be a little careful if you're using diluted bleach -- it's great as a disinfectant, but sometimes bleach can eat away at things such as plastic.
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