Looking for advice on clay bar cleaning

[2ndAmend]

And why I only use water from my DI system for washing !

I have it in my Amzn "Saved for Later", $460.. Hard decision for someone cheap like me! Won't the ceramic stop the water spots?

 

[Speedy!]

Ceramic coating helps but does not eliminate hard water spots. I use my CR Spotless every time I wash our cars. Resin lasts about 4 years so well worth the investment.

 

[2ndAmend]

Is this the right one? Spotless DIW-20?

https://www.walmart.com/ip/CR-Spotl...jgf_3&athancid=51822878&athposb=0&athena=true