I have always used Meguiars Gold Class or UWW but wondered if there is anything better out there? My S5 has just had its annual top up detail and coatings reapplied so a good time to look at other options. I read both GC and UWW leave a residue on the car that isnt great if you have any form or protection coating applied. Not sure how much substance there is to that. Recommendations? What is everyone else using?