I used my newly acquired foam gun for the first time this weekend. I used approximately 1 oz of Meguiar's Deep Crystal soap diluted in the quart bottle on the Simple Green branded gun, and experimented with the gun's dilution settings. Even at the lowest setting, I was very happy with the amount of foam achieved but finally decided the 3rd strongest setting was best for this soap.
To say I was happy with the results is an understatement. I washed both of our cars and was thrilled with the results. I rinsed my mitt in a bucket of water at least once for each body panel. I wasn't constantly re-soaping my mitt and there was less to do as each body section basically just need a swipe of the mitt instead of going back over several areas to work on stuborn dirt areas.
Most noticable was on my wife's 5 year-old Tahoe. I don't wash it as often as I do my car and since she doesn't put forth effort to keep it clean herself, I don't feel too much guilt from the lack of attention. And, I have to admit it had been about a month since I last washed it. She parks directly beneath a maple tree and it had several remnants of bird droppings along with general contaminants from the tree. I rinsed it first and then foamed it up. Because of how dirty it was, I then rinsed the soap completely off so as to remove the first layer of grundge. Gosh! It was as nice looking after this rinse as most cars on the street. Then I proceed to re-foam and go over it with the mitt. After washing and drying, I don't think the Tahoe looked this good since it was new.
With the foam gun, I'll probably give her Tahoe at least a soap rinse on the weekends when I don't completely wash it.
My Cadillac gets a good bath every weekend weather permitting. Generally after a wash, but before I dry, I give the car a good look over to find a few areas that needs a little more work to remove contaminants from the maple tree. This time, it was a clean as a whistle and I did not have to go back over any areas before drying. This saved me considerable time - I'd say at least 10 minutes per vehicle.
Deep Crystal is not my normal soap (Gold Class is) but I had some left over from when my local AutoZone was out of Gold Class. This pretty much used up my Deep Crystal and look forward to trying out Gold Class in it next time.