I only go to my car wash 3 times week so I normally leave the tips alone. We don’t get a lot of hard freezing weather up here in the Pacific Northwest, not like the rest of the country. Right now I’m using a Beige tip. It was in the mid-teens at night and in the mid 30's during the day last week and we didn’t have any problems. There is no Glycol in the anti-freeze foam brush soap. The active ingredient is Methanol, which is made from Natural gas. If you have access to 55 gallon drum of Methanol you can make your own anti-freeze soap by pumping out 5 gallons of Methanol and then adding 5 gallons of concentrated foam brush soap.