One solution that works pretty well:
1 part of bicarbonate used for food or cleaning
1 part of icing sugar
Mix and add water slowly until you get a creamy stuff not too much liquide.
Put that mixture in a jar lid or a plastic box in which you cut a hole.
In less than 48h you'll see a difference.
I use that in.my greenhouse when ants come inside the pots and play with seeds pods