Shower caps!! Genius!! I bought a pack of 5 from my IGA for under $2!!
Not only do they keep it clean in there, but because they are see-through you don't have rummage through everything to find what you have, you can clearly see it.
I tried this for the first time recently when my family went on a weekend away... It worked a treat!
And here is a glimpse of some of the fun times that we had at Underwater World on the Sunshine Coast while we were away :)