Dobrý den, nasypal jsem čistič Fredy do umyvadla v koupelně, ale poté jsem jej zapomněl zalít horkou vodou, a čistič mi v sifonu ztvrdnul, takže mi voda z umyvadla neodtéká. Jak se to dá odstranit? Zkoušel jsem to mechanicky prorazit (kovovou tyčkou), ale bohužel neúspěšně, zkoušel jsem to zalévat horkou vodou, také bez výsledku. Můžete mi někdo poradit, co s tím? Děkuji, L.
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