I have a newer silver colored Mercedes that goes through one of the automated soft rag type car washes about once a week. What wax product would you recommend to use and how frequently should it be applied? The car is on the road about 40,000 miles a year and I know that the automatic car washes are not the best idea but I travel so much and don't have time to hand wash. I am looking for the best protection I can get with the easiest application. Thanks