DIY - zrób to sam

You will need:

1/2 cup regular baking soda
1/2 glass ammonia

How to use it:

Boil water in a big pot.

Slowly pour out soda into water using a teaspoon.

Put filters into boiling water. Grease and dirt will immediately start dissolving. Remove the pot from fire in a couple of minutes. If filters are extremely dirty, repeat the process with a fresh supply of water.

If grease didn’t clean off completely, put the filters in hot water with ammonia (1/2 glass of ammonia for 118 fl oz (3.5 l) of water). It’s necessary to open windows and put on a filter mask to protect yourself from the strong smell of ammonia.