I used the non-ionic sufacant at tractor supply. I sprayed cleth for the 1st time last summer. Couldnt get back to camp for a few weeks. But, I have a great stand of clover. Had oats, turnips, and red and white clovers spring planted in a new spot with no prior weed control. Mowed it with a brush hog, spring harrowed it, planted, fertilizer, and limed, rolled ATV tires on it and crossed my fingers. Thinking it was late july early august.
Some say the surfacant harms clovers. Some say cleth stunts everything. Killed the oats. Was hoping for a better kill on sedge grass. And the golden rod in one plot never got harmed. Turnips survived fine too.
What kind of grass are you looking to kill. Broadleafs and clover butyrac 200 is a better choice I believe.
Its important to ID what your trying to kill. While the clethodim wont kill what you planted, what you may have left is another competeing weed thats tougher to kill. Learned that with the spot sprayer the past year.