I think it's best you wash it in the shade. However I recommend checking your Microfibre Cloth Make sure your using one for washing and ANOTHER Seperate one fro Drying. Rinse, Clean Solution, then Rinse Again , then a new Clean Microfiber dry. When your drying only dry in horizontal and vertical direction make a clean streak do not swirl I repeat "DO NOT SWIRL DRY or do any circular motion!" you will get spots especially easy that way. Process is a big part of cleaning the car correctly. I hope this helps.