If you are serious about cleaning your car then that DI vessel I linked before is the way to go. The resin inside doesn’t last forever but it’s very useful for just jet washing the car and then leaving it. It’s the contaminants in the water that leave the spots, or the hardness etc. Deionised water doesn’t have that problem.The issue is I recall reading other forum threads where going to one of the car hand washes resulted in swirls and scratches due to the amount of cars being washed with the same mitts etc so I thought I would do it myself at home… alas, I made it worse for myself
I used Gtechniq H9 Water Spot remover, only about £11-12.
You basically wash the car, without polar seal as it may add an extra layer, and wipe the car with some microfibre cloths with the remover on it In small sections, or if it’s just the bonnet, just that.
When you’ve finished, you need to also rinse it or wash it again as it’s slightly acidic so you don’t want to leave it on.
The paintwork needs to be cool as well. As others have said, it’s not a good idea to clean cars in the sun. You can get filters to take the hardness out of the water for the final rinse so you can let it dry naturally if you want to.
If you are anywhere near the NW, you are welcome to use some of mine, but not until next weekend as I’m self isolating.
I did the same as you with my last car and started to clean it myself, I had a few mishaps along the way but once you’ve found a routine that suits you, I’m sure it will be fine.
Thanks everyone… I really think this is down to the polar seal drying too quickly before I got back to properly dry the car… completely my fault on all fronts. :-(