You can dismantle that in parts right, you can take it to the shower piece by piece and wash with soap. Try those eco or organic detergents, otherwise warm water and regular soap will do. You may want to soak the balls by batches into a small basin or in the tub.
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I would Soak the balls in pails with warm soapy water and assuming it's not yet assembled, bring it into the shower and scrub it with sponge and soap and rinse off with warm water.