Why are there small dots on the car glass that cannot be washed off?

[StElliott]

You can use detailing clay to clean them. Here are some relevant tips about car washing: 1. Prepare car washing tools: The tools for car washing are simple - a bucket, car washing sponge, spray bottle, car wash wax, and several towels will suffice. It's best to use specialized car washing towels that have strong water absorption. 2. Find a good location and clean the drainage channel: Before washing the car, find a suitable spot, try to avoid roadside areas with lots of dust, and in summer avoid direct sunlight. After parking, clean the drainage channel under the front windshield first. Otherwise, dirty water will accumulate here and may even flow to places it shouldn't.