If you press this hidden switch on the washing machine, all the dirty water drains out immediately

Before opening the sediment filter cover, place a cloth underneath to prevent residual dirty water from escaping and dirtying the floor. Remove the filter bag by gently twisting it and then pulling it out.

Clean the filter with a brush to remove dirt and detergent residue.
Check the filter compartment in the machine and wipe it with a damp cloth before replacing the filter.

Differences by machine type
Usually, the filter located under the machine housing is intended for front-loading washing machines. In top-loading machines, the sediment filter is in the form of a plastic bag or tray that sits directly in the washing drum.