+1 on thisEasy: Wipe on, Wipe off - Turtle wax Hybrid Hydrophobic Wax
Easier: Spray on, Rinse off - Turtle wax Dry and Shine.
Both work and are excellent value at less than a Tenner, often less than half that.
So slick too^
Sometimes I'll top up after a wash by just wiping over the paint with a damp MF mitt that has a squit of the TW sealant on.
Just Wipe and not even buff when the panel has had a 90% dry with a towel after washing