I bought the £50 detailing starter kit, I made a 750ml spray bottle with 100ml of the wheel cleaner to 650ml of water, then made roughly a 500ml to 2.5L water pre wash mix. I used around 250ml of the wheel cleaner bottle giving the wheels plenty of spray and used about 2/3 of the pre wash mix to cover my car, basically making sure I used plenty. I was really impressed by both, the wheels came clean with no scrubbing at all, the pre wash took off nearly all of the dirt, by the time I got to the snow foam I had only a few spots that needed a quick wipe, in saying that I gave the car a quick once over with a car wash mitt which took a couple of minutes, then pressure washed all over. All in all it probably took 20 minutes to get good results.