Mop up the rain puddle at the bottom of the slide with a diaper
Nina's hack will come in handy when you're at the playground after some rainy weather:
A solution to drying up the pool at the bottom of the slide after a rainy day (when you forget to bring a rag): use a disposable diaper! I didn't want to use his clean washcloth, so I turned a Pull-up inside out and sort of wore it like a glove to wipe up the water. It actually worked better than a rag because of its absorbency.