Clean the siding around the hole with vinyl siding cleaner or dish detergent and water then dry the siding.
Cutting hole in vinyl siding.
Place a strip of siding on the work table and align the place you plan to cut it with the edge of the table.
Use tin snips or a rotary tool to make curved cuts.
You can also use tin snips to make crosscuts.
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When making longitudinal cuts score with a knife and break along the score line.
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Fit a circular saw with a fine toothed plywood cutting blade.
Make crosscuts on vinyl siding using a circular saw but you should install a vinyl cutting blade to minimize chip out.
Cutting the vinyl siding is easy.
A hole saw tin snips etc will slice right through it.
It should snap apart.
For the smoothest cuts put the blade in.
When we cut with a circular saw we often install the blade backwards to minimize ripping and tearing of the vinyl.
A clean way to cut vinyl siding is to score it with a utility knife and then bend the vinyl at the score.
Cut a scrap piece of siding to a length that is several inches longer than the hole.