has anyone ever mixed their own anti freeze chemical solutions using antifreeze, ethanol, windshield washer solution, etc. added to chemical. we have in mid atlantic area and typically dont have more than 15-20 days per year sub 30 and its mainly at night. we have already had 10 or so nights this year already and several below 20-25 degrees. appreciate any creative solutions there might be out there. this is mainly for my foam brush system and presoak on auto. we weep our hp systems and dont have much problem down to about 15-20 degrees. appreciate help.