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Chemical cost per car is an average of the wash packages, meaning a base wash may for instance cost around $.45 in chemicals and a top wash more around $1.20 with our average being $.64 per car.Detergent costs also vary by supplier and discount levels, which are often based on order volume.lectricity has some efficiency when busy, when motors keep running they cost less than starting and stopping them. Therefore on a busy day the electric cost per car may be $.25 / car, but when starting up all motors for one car may be $1.00 / car, as the $.50 / car is an average.
At the same 100-cars-per-day average, thatâs 7,000 gallons a day, 210,000 a month, or 2.52 million gallons of water a year. A tunnel car wash with a moderate amount of high-pressure applications could use 120 gallons of water per vehicle. Assuming an average of 400 cars washed, daily usage would total 48,000 gallons.