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Unblock two drains and investigate bathroom sink earthy smell

We have two blocked drains (outdoor) - one thats below the kitchen and one next to the washhouse. Also our bathroom basin has an unpleasant earthy (more earthy than sewage) smell permeating from it - sometimes it's stronger than others. We tried putting some space invader in the gaps at the bottom of the basin to no avail. It goes away/dissipates slightly if we put a dehumidifier next to the basin.