Leach in - Idioms by The Free Dictionary
To enter (some substance or material) through percolation. Rising seas have allowed high concentrations of salt to leach in across these coastal farmlands. After the spill, acids and other toxins began leaching in on the cliffsides.
leach in (to something)
[for a substance] to seep or penetrate into something. The salt leached into the soil and ruined it. A tremendous amount of salt leached in.
References in periodicals archive
Another somewhat damaged tile is on the newer  home of Edgar Skinner, the Leach Pottery accountant, the house it seems, where Japanese potter Shoji Hamada--who set up the Leach Pottery with Leach in
LED AWAY: Leach CORNERED: Leach with Cambodian cop NOWHERE TO HIDE Michael Leach in
handcuffs on the end of the double bed
4 percent of the initial preservative oxides content, respectively, but leach in