WX Block/WX Seal Question

So last year I buffed out my Libelle with 3M Finesse, and then waxed and sealed it with WX Block/Seal. Since spring has tentatively arrived here in the frozen tundra of the upper midwest, I started thinking about getting the old girl ready for the season.

So do I need to do any surface prep before reapplying the WX block other than washing off the winter grime and dirt? If not what do you suggest to do?

Thanks

Peter

Libelle N2045D S/N 13