I dropped a tube of oil based hair conditioner in the shower a few weeks ago. The cap broke, and it's a tube, so I have to store it in a bag that I tied to the grab bar in the shower. Because if I let the tube point down, the conditioner will eventually ooze out.

So far, I haven't ended up with a slippery mess in there. I keep my big bottle of shampoo, and shower gel in the same bag. (it's a mesh bag that's made for showers/going to a pool. It has pockets. If the bag starts to get icky, I'll just buy a new one)