Perhaps you have already had the idea of using your window vacuum cleaner in the bathroom? This is an obvious application, because tiles and grout - especially silicone grout - last longer if they are dried regularly after showering or bathing. The Nemo by Leifheit (price with wall holder from approx...

Solid and durable window vacuum cleaner with automatic suction function for all smooth surfaces. No water penetrates the waterproof housing, even from the outside. The tank cap in the handle ensures quick emptying. Sensors ensure the best device protection.