Just some stuff about me.
full kettle of hot water, pour slowly
if doesn’t work: 1/3 cup white vinear, 1/3 cup baking soda, mix and immediately down the drain. let sit for an hour, rinse with hot water
if it doesn’t work: drain snake https://www.bol.com/nl/nl/p/purepeak-ontstoppingsveer-geschikt-voor-douche-keukenafvoer-wc-wasbak-160-cm-gootsteenontstopper-rioolreinigersveer-afvoer-ontstopper-rioolveer-drain-cleaner-rioolontstopper/9300000154505518/?bltgh=iPIqf-RSZ4VS-wnp7v9JGA.nPMcpgyjtZBeqgFuDVdMMA_0_4.8.ProductTitle https://www.bol.com/nl/nl/p/mcdevens-ontstoppingsveer-10-meter-7-6mm-met-coating-rioolveer-rioolontstopper-rioolreinigersveer-afvoerontstopper-ontstopper-gootsteenontstopper/9300000165335623/?bltgh=jUPbLpf0f9XZNoJ5-oJBFQ.2_17.18.ProductTitle