Water in the interior

Hello everyone, I now discover every day a different problem…… :-/ I wondered why the Smart has been so busy lately. I took a closer look at the one before and raised the carpet. And look there….. The foam was soaked with water. It can’t come out of the trunk, or from the side windows. The trunk is dry. The side windows were leaking, but they had them sealed. Someone had a hard time. Idea where the water could come from?? Then I guess you’ll have to drive to dry out……. Has someone had good experiences with something like this in the HH room and can recommend something to me??? Cost, etc.??? Nice WE to all Agnes.