What is the caulk material? That makes a difference too. Hardware stores sell a caulk removal tool, but it may not be good for your siding. I never use anything containing silicone, it does not adhere well when cured and allows moisture to seep in.
To make a clean, neat caulk. Use painters tape to mask off the seam, crack. I allow 1/8" for the caulk bead on each side. Remove the tape after caulking and you have a clean, neat job. Then_remember to not touch it and smear your work. (been there done that)
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"