I'll take your Collinite and raise you to Zaino CS.

Spray on, walk away, and boy what a shine! Lasts up to 9 months cover, perfect for over the winter.

1 spray of the stuff on a wing for example, 2 or 3 on the bonnet/roof, I even do my wheels with it. Top detailers/valeters on DW are using it with excellent results.
For real winter cover, clay the car first, then three coats of ZFX'd - Z2, then Zaino CS over the top. Should last right through to next spring. You still have to wash the car occasionally though
