In india I used to use 3M finesse it marine paste, which is a pretty agressive compound, but it cuts through scratches ( and clear coat!) like butterI use 3m scratch system with great success. It’s like $20.
https://www.team-bhp.com/forum/modi...19143-touch-up-paint-tubes-9.html#post1091994
Pity you don't get it in the US.