Not optimal, but better than nothing

Doesn't the shampoo destroy the waxy cuticle on grass? That wax helps lock in the moisture and helps protect the plant from disease and pests....

It might impair the waxy cuticle on the grass it hits, but that grass will be mowed off within 2 weeks.

What exactly is the shampoo used for (on the grass)?

Never mind, I see it's to soften the soil....