For an extra hard-working day, i use turtle wax liquid claybar to clean up the body during wash, then machine-buff with Megs NXT2.0 for big panels like the bonnet, roof and doors. Then hand polish to go through what the buffer didn't cover.
I apply MEG NXT2.0 on my bonnet and roof every 2 weeks after wash, just to give that extra gloss and 'hydrophobic' layer as the bottle claims hahaha