Try vinegar 1 cup and add baking soda, it will foam so cover wait 20 minutes and pour hot water into the drain. Hope it helps.
Pour some baking soda down the drain, then pour some vinegar down. Immediately cover the drain with a cloth and hold down. The force of the foaming should push the clog down. Then pour hot water down.
Boiling water and Dawn :) https://chemistrycachet.com/coolest-things-you-can-do-with-blue-dawn/