If necessary remove a few pieces of siding nail the undersill then replace the siding.
How to remove flashing adhesive off vynl siding.
Repeat until all the tape residue.
You may need to use a flat straight edge such as a plastic scraper or old credit card to lift the adhesive from the vinyl.
How to remove tape residue from vinyl.
Drench a paper towel in either rubbing alcohol or white vinegar.
Use a zip tool to disconnect two pieces of siding.
Use a dry rag or cloth to gradually loosen the residue.
Zip tools disconnect a higher piece from a lower piece.
Tack z flashing over the channel extending it slightly past the cutout on both sides.
Apply the vinegar to the affected area of the vinyl surface and allow it to soak for 10 to 15 minutes to soften the adhesive.
Place the putty knife under an edge of the tape and begin to push the tape loose.
Both have properties that safely dissolve the tape residue without.
And seal with silicone caulk.
If you need two or more pieces of flashing overlap the joints by 4 in.
Reveal the nails anchoring a piece to the wall by sticking the zip tool under the bottom of the piece above it.
Remove all loosened sticky tape from the vinyl.
Wipe the paper towel over the affected area of your vinyl surface.