An insert assembly for a foam generating device includes a first insert and a second insert with a channel defined therethrough. Inserts may be formed by two shell halves that are coupleable to one another to define the channel. A plurality of ribs extends along an interior surface of the channel. The channel is configured to grip porous pad structures by the plurality of ribs for generating form by breaking-up the cleaning solution and agitating. The ribs may be arranged horizontally relative to a longitudinal axis of the insert assembly. Inserts may be arranged in series along a longitudinal axis of the foam generating device.