Try Bio Kleen by Power Service, works great. One once to 20 gallons for shock treatment and 1/2 after that for maintance. A 16 oz bottle has lasted me two years and I've shocked several cars and use it about every 3 rd fill up. Follow the link.Power Service

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'10 Chrysler T&C Stow-N-Go White. Grandpa's ride.

'13 Chrysler 200 Touring Candy Red. Grandma's ride.

Age and cunning will always over come youth and vigor.