Airing cupboard is fine for now, but you need to get it to the repairer asap - the chemicals won't have done it any good.
Bloke I knew dropped his new mobile phone in a chemical toilet, dried it on a radiator, then when it still wouldn't work, took it back to the shop. The woman there opened it up and it was all chemical-ised inside. He played innocent and got a replacement, so what story you tell the shop/insurance company is up to you.