Hahaha I've never heard anything about milk helping your squats in particular. I drink milk because its nutritious, has protein and other vitamins. Thats besides the point.
Just keep banging them out. Do em 3 days a week. 1st day 5x5s, second day work on form, box sqauts 5x2 with lighter weight, work on speed, and the last day do em again, maybe doubles or triples, work at 85-90% if you can. GHR seems to help out alot too if your gym has one.
Anyway make a routine yourself thats whats worked best for me, modifying other routines. And you can do them 3 days a week. The best way to get your squat up is not leg press, or any other machine, its to SQUAT! Hope it helps.