Caulking recommendations

I have tried every tip I was told and many others but caulking will eventually dry out no matter what you do. I have learned to touch up other areas, add a little here and there and be prepared to buy another tube next time.

I know it is extra work but have you tried a sponge with bleach, 409, Bleeche White, etc.

EDIT: I have read on this forum that one poster used a vacuum sealer and it works well.