My 70yo house has redwood siding; shiplap below board and batten. The battens are are T-shaped with the leg of the T fitting between adjacent boards. The bottom end of many battens moved out from the boards leaving a gap (typically 1/16 - 1/8 inch; worst case 1/4 inch). In the past, I just caulked the gaps. Now that I am retired I have started repairing the problems (pretty much all due to the nails rusting) instead of applying Band-Aids. In many places where I used flexible caulk it has split, though it is still flexible and may still be sealing out water (see photos). Any suggestions on how to remove the caulk that might work better than my current method (a utility knife, scraper, and lots of effort) will be appreciated.
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