Reactive balls soak up oil, but they can also soak up water. If you have water in the cover, it is likely just a very minute amount.
I had a ball that sat on some carpet in my bedroom. Little did I know that, after cleaning the carpet, my wife left it on a damp spot and it soaked into my ball, leaving a rather large discoloration spot on it.
I was told I could bleed it out with heat ( like baking the oil out ), but I never did. Couldn't tell by its reaction that anything was wrong with it, and I used it for a while after that. It never did get 100% back to normal appearance, but the performance wasn't affected at all.
Don't leave your ball in the water over a few minutes at a time and always make sure it is completely dry before setting it on anything that might hold moisture next to the ball surface and you should be fine.
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