I tried a 60/40 mix water to shampoo initially and still thought it didn't foam as much as some of teh stuff I've seen on youtube, but when the container was nearly empty it came up trumps. Next time I used shampoo neat and worked around the adjustable flow rate was much better. I'm not sure if I was expecting too much though, or that I'd left the car too long before foaming as even with the pressure washer after about 20 minutes, it still needed a fair bit of close up work to get the majority of muck off the car. then again, as I mentioned previously, the roads around my area are mudbaths at times.