SRP and Bluet-cut will only fill in the light scratches till you wash the car again and they get wash out in time, best way is to have the car machine polished with a rotary or dual action polisher, this will remove all minor scratches and marks, would set you back around £150-£300 depending on who does it and how much the cars clear coat needs cutting back!
Or if you've arms like Rambo you could hand polish them out using gtechinq P1 polish, it can be done but will take ages!
Also your method of washing will help keeps scratches down, use 2 buckets, 1 with clean soapy water 1 with clean rinsing water, also use a wash mit like a noodle type or sheep skin, never use a sponge!!!
Wash from the top down washing dirt away and use straight lines not circles as you wash, rinse and dry with drying towel.
Most of the stuff you can buy cheaply from asda's car section for a few quid each!
Goon youtube there's tons of car washing ids to help you.
HTH...