Hardly used very low mileage Clio 1.2. 2015 reg. Left shop car park in heavy rain and suddenly a loud continuous alarm (siren type - I don't have an alarm fitted) sounded. No dashboard lights came up. Sounds ridiculous but someone had put a paper card ad on windscreen under wipers and I wondered if the wipers were 'not happy'. After about 2 minutes it went off. Wondered if I should get garage to check out diagnostics?