That's really not how you use the temperature knob ... set it once at a comfortable level ... Car doesn't get cooler by setting the temperature lower than necessary ... If cabin temp is 29C, you get same cooling effect whether you set temp to 18C or 25C ...
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You risk clogging the nozzles and hoses ... Best to used distilled water ...
mukhang hard water mark stains na yan. tipong kahit nadaanan na ng wiper, parang malabo parin ..
elevo watermark remover (or other brands basta matapang) lang yan for the outside, then make sure din na malinis yung loob ng windshield.
minsan kasi pagka car wash mo, di mo na makikita yung old stains, pero andun yun sa windshield parin. madalas ito mangyari sa mga walang garage, and nauulanan then naarawan yung auto.