The build up of old caulking interferes with the positioning of new trim for the siding.
Installing vinyl wall trim.
This video shows how to properly trim around fixtures when installing vinyl siding.
Press the vinyl trim up against the wall and press firmly all along the base to secure it to the wall.
Scrape away old caulking around windows and doors.
Miter or cut tabs at the ends.
It may help to scribe a light line on the wall that you can line up the top edge of the molding with as you go to ensure a straight application.
If the trim sticks out too far you may be using more adhesive than necessary.
Install j channels at doors and windows and under roof eaves and rakes.
Along the tops install j channel trim with horizontal siding and base trim with vertical siding.
Use your hands and press along the length of the vinyl trim making sure it is even with the ground.
Surface preparation for vinyl siding installation securely nail all loose boards and wood trim and replace any rotted boards.
Press the vinyl against the wall and flush on the floor as you work down the wall.