It’s just paint mate, no specific products required - use what you like. Scratches are inflicted during the contact phase of any wash, so just take it easy.
You shouldn’t use polish every wash, polish once or twice a year as required as it’s abrasive. I wash as normal (wheels first then paint - rinse, foam, rinse, foam and contact wash with two bucket method, rinse, dry) then just use a good wax or sealant every 3 months or so and then top with detailing spray to finish every wash.
I had mine professionally polished then had the front end ppf’d. Still looks like glass as I’m careful.