Gray Beard,
 Also put a couple squirts of Dawn Dishwashing liquid in it to help cut the grease. That's what I do. I buy a gallon of windshield washer fluid. I had Dawn dishwashing liquid and 91% isopropyl alcohol to it. I've been using this mix for 14 years now to clean my planes. A gallon will usually last a full flying season (we have long flying seasons too), and total cost is less than 2 bucks or so.

Ken