|
Washing the car in the sun could leave some sort of soap scum film, but the grainy feeling doesn't really sound like that. If it was soap scum, it'd be more of a greasy/slimy type of feeling. A grainy feeling usually means there's microscopic sediments on the car, and it could be anything to be honest with you. From paint overspray, industrial fallout, tree sap, etc there are many explanations for that feeling.
Use the claybar, and how that feels. If I recall correctly, you had your car repainted a couple weeks/months ago, and over time these contaminants may have bonded to the car. I typically clay my car about twice a year for upkeep. It's really hard to keep the paint in pristine condition if it's a daily driver, and even if it's garaged. After claying, run your fingers along the paint and report back how it feels.
__________________
Brian
|