For getting rid of small scratches - https://drivedetailed.com/beginners-car-polishing-guide-how-to-remove-swirl-marks/
I use this in a spray with a microfibre cloth for application and works great. https://www.amazon.co.uk/Demon-Shine-5L-Pour/dp/B004YBPD0I/ref=sr_1_1?dchild=1&keywords=demonshine&qid=1595933041&sr=8-1